diff --git a/glfw/glfw.py b/glfw/glfw.py
index 8ca8c33cb..df2d188da 100755
--- a/glfw/glfw.py
+++ b/glfw/glfw.py
@@ -9,7 +9,7 @@ import shutil
 import sys
 
 _plat = sys.platform.lower()
-isosx = 'darwin' in _plat
+is_macos = 'darwin' in _plat
 base = os.path.dirname(os.path.abspath(__file__))
 
 
@@ -19,14 +19,14 @@ def init_env(env, pkg_config, at_least_version, module='x11'):
         x for x in ans.cflags
         if x not in '-Wpedantic -Wextra -pedantic-errors'.split()
     ]
-    if not isosx:
+    if not is_macos:
         ans.cflags.append('-pthread')
         ans.ldpaths.append('-pthread')
     ans.cflags.append('-fpic')
     ans.cflags.append('-D_GLFW_' + module.upper())
     ans.cflags.append('-D_GLFW_BUILD_DLL')
 
-    if isosx:
+    if is_macos:
         ans.ldpaths.extend(
             "-framework Cocoa -framework IOKit -framework CoreFoundation -framework CoreVideo".
             split()
diff --git a/kitty/cli.py b/kitty/cli.py
index 4f2cc795f..fed069e9d 100644
--- a/kitty/cli.py
+++ b/kitty/cli.py
@@ -6,7 +6,7 @@ import argparse
 from gettext import gettext as _
 
 from .config import load_config
-from .constants import appname, str_version, isosx, defconf
+from .constants import appname, str_version, is_macos, defconf
 from .layout import all_layouts
 
 
@@ -70,7 +70,7 @@ def option_parser():
         default=False,
         help=_('Output commands received from child process to stdout')
     )
-    if not isosx:
+    if not is_macos:
         a(
             '--detach',
             action='store_true',
diff --git a/kitty/constants.py b/kitty/constants.py
index e74ce2b8b..266c39b3f 100644
--- a/kitty/constants.py
+++ b/kitty/constants.py
@@ -13,7 +13,7 @@ appname = 'kitty'
 version = (0, 5, 1)
 str_version = '.'.join(map(str, version))
 _plat = sys.platform.lower()
-isosx = 'darwin' in _plat
+is_macos = 'darwin' in _plat
 
 
 ScreenGeometry = namedtuple('ScreenGeometry', 'xstart ystart xnum ynum dx dy')
@@ -25,7 +25,7 @@ def _get_config_dir():
     if 'KITTY_CONFIG_DIRECTORY' in os.environ:
         return os.path.abspath(os.path.expanduser(os.environ['VISE_CONFIG_DIRECTORY']))
 
-    candidate = os.path.abspath(os.path.expanduser(os.environ.get('XDG_CONFIG_HOME') or ('~/Library/Preferences' if isosx else '~/.config')))
+    candidate = os.path.abspath(os.path.expanduser(os.environ.get('XDG_CONFIG_HOME') or ('~/Library/Preferences' if is_macos else '~/.config')))
     ans = os.path.join(candidate, appname)
     os.makedirs(ans, exist_ok=True)
     return ans
diff --git a/kitty/fonts/list.py b/kitty/fonts/list.py
index a39a1923b..8569c8cfb 100644
--- a/kitty/fonts/list.py
+++ b/kitty/fonts/list.py
@@ -3,9 +3,9 @@
 # License: GPL v3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 import sys
-from kitty.constants import isosx
+from kitty.constants import is_macos
 
-if isosx:
+if is_macos:
     from .core_text import list_fonts
 else:
     from .fontconfig import list_fonts
diff --git a/kitty/fonts/render.py b/kitty/fonts/render.py
index 61fbefd46..2fbce2ba9 100644
--- a/kitty/fonts/render.py
+++ b/kitty/fonts/render.py
@@ -8,7 +8,7 @@ from collections import namedtuple
 from math import ceil, floor, pi, sin, sqrt
 
 from kitty.config import defaults
-from kitty.constants import isosx
+from kitty.constants import is_macos
 from kitty.fast_data_types import (
     Screen, change_wcwidth, get_fallback_font, send_prerendered_sprites,
     set_font, set_font_size, set_logical_dpi, set_send_sprite_to_gpu,
@@ -16,7 +16,7 @@ from kitty.fast_data_types import (
 )
 from kitty.fonts.box_drawing import render_box_char, render_missing_glyph
 
-if isosx:
+if is_macos:
     from .core_text import get_font_files, font_for_family
 else:
     from .fontconfig import get_font_files, font_for_family
@@ -243,7 +243,7 @@ def test_fallback_font(qtext=None, bold=False, italic=False):
 
 def showcase():
     change_wcwidth(True)
-    f = 'monospace' if isosx else 'Liberation Mono'
+    f = 'monospace' if is_macos else 'Liberation Mono'
     test_render_string('He\u0347\u0305llo\u0337, w\u0302or\u0306l\u0354d!', family=f)
     test_render_string('你好,世界', family=f)
     test_render_string('|\U0001F601|\U0001F64f|\U0001F63a|', family=f)
diff --git a/kitty/main.py b/kitty/main.py
index 3c29a9a64..d8efa5ef5 100644
--- a/kitty/main.py
+++ b/kitty/main.py
@@ -12,7 +12,7 @@ from .borders import load_borders_program
 from .boss import Boss
 from .cli import create_opts, option_parser
 from .config import initial_window_size, load_cached_values, save_cached_values
-from .constants import isosx, iswayland, logo_data_file
+from .constants import is_macos, iswayland, logo_data_file
 from .fast_data_types import (
     change_wcwidth, create_os_window, glfw_init, glfw_terminate,
     install_sigchld_handler, set_default_window_icon, set_logical_dpi,
@@ -34,7 +34,7 @@ def load_all_shaders():
 
 
 def init_graphics():
-    glfw_module = 'cocoa' if isosx else 'x11'
+    glfw_module = 'cocoa' if is_macos else 'x11'
     if not glfw_init(os.path.join(base, 'glfw-{}.so'.format(glfw_module))):
         raise SystemExit('GLFW initialization failed')
     return glfw_module
@@ -47,7 +47,7 @@ def run_app(opts, args):
     w, h = initial_window_size(opts)
     window_id = create_os_window(w, h, encode_wm_class(args.name, args.cls), True, load_all_shaders)
     startup_ctx = init_startup_notification(window_id)
-    if not iswayland and not isosx:  # no window icons on wayland
+    if not iswayland and not is_macos:  # no window icons on wayland
         with open(logo_data_file, 'rb') as f:
             set_default_window_icon(f.read(), 256, 256)
     set_logical_dpi(*get_logical_dpi())
@@ -99,12 +99,12 @@ def main():
         sys.setswitchinterval(1000.0)  # we have only a single python thread
     except AttributeError:
         pass  # python compiled without threading
-    if isosx:
+    if is_macos:
         ensure_osx_locale()
     try:
         locale.setlocale(locale.LC_ALL, '')
     except Exception:
-        if not isosx:
+        if not is_macos:
             raise
         print('Failed to set locale with LANG:', os.environ.get('LANG'), file=sys.stderr)
         os.environ.pop('LANG')
diff --git a/kitty/utils.py b/kitty/utils.py
index efeb2f540..bfde2c4ec 100644
--- a/kitty/utils.py
+++ b/kitty/utils.py
@@ -17,7 +17,7 @@ from contextlib import contextmanager
 from functools import lru_cache
 from time import monotonic
 
-from .constants import appname, isosx, iswayland
+from .constants import appname, is_macos, iswayland
 from .fast_data_types import (
     GLSL_VERSION, glfw_get_physical_dpi, glfw_primary_monitor_content_scale,
     redirect_std_streams, wcwidth as wcwidth_impl, x11_display, x11_window_id
@@ -78,7 +78,7 @@ def get_logical_dpi(override_dpi=None):
     if override_dpi is not None:
         get_logical_dpi.ans = override_dpi
     if not hasattr(get_logical_dpi, 'ans'):
-        if isosx:
+        if is_macos:
             # TODO: Investigate if this needs a different implementation on OS X
             get_logical_dpi.ans = glfw_get_physical_dpi()
         else:
@@ -117,7 +117,7 @@ def parse_color_set(raw):
 
 
 def set_primary_selection(text):
-    if isosx or iswayland:
+    if is_macos or iswayland:
         return  # There is no primary selection
     if isinstance(text, bytes):
         text = text.decode('utf-8')
@@ -126,7 +126,7 @@ def set_primary_selection(text):
 
 
 def get_primary_selection():
-    if isosx or iswayland:
+    if is_macos or iswayland:
         return ''  # There is no primary selection
     from kitty.fast_data_types import get_primary_selection
     return (get_primary_selection() or b'').decode('utf-8', 'replace')
@@ -155,7 +155,7 @@ def open_cmd(cmd, arg=None):
 
 def open_url(url, program='default'):
     if program == 'default':
-        cmd = ['open'] if isosx else ['xdg-open']
+        cmd = ['open'] if is_macos else ['xdg-open']
     else:
         cmd = shlex.split(program)
     return open_cmd(cmd, url)
@@ -197,7 +197,7 @@ def end_startup_notification_x11(ctx):
 
 
 def init_startup_notification(window, startup_id=None):
-    if isosx or iswayland:
+    if is_macos or iswayland:
         return
     try:
         return init_startup_notification_x11(window, startup_id)
@@ -209,7 +209,7 @@ def init_startup_notification(window, startup_id=None):
 def end_startup_notification(ctx):
     if not ctx:
         return
-    if isosx or iswayland:
+    if is_macos or iswayland:
         return
     try:
         end_startup_notification_x11(ctx)
@@ -233,7 +233,7 @@ def remove_socket_file(s, path=None):
 def single_instance_unix(name):
     home = os.path.expanduser('~')
     candidates = [tempfile.gettempdir(), home]
-    if isosx:
+    if is_macos:
         from .fast_data_types import user_cache_dir
         candidates = [user_cache_dir(), '/Library/Caches']
     for loc in candidates:
@@ -294,6 +294,6 @@ def single_instance(group_id=None):
 
 
 def encode_wm_class(name, cls, title=appname):
-    if isosx:
+    if is_macos:
         return title
     return '\x01' + (name or cls) + '\x1e' + cls + '\x1e' + title
diff --git a/kitty_tests/fonts.py b/kitty_tests/fonts.py
index c69823889..2a96e7150 100644
--- a/kitty_tests/fonts.py
+++ b/kitty_tests/fonts.py
@@ -4,7 +4,7 @@
 
 from collections import OrderedDict
 
-from kitty.constants import isosx
+from kitty.constants import is_macos
 from kitty.fast_data_types import (
     change_wcwidth, set_logical_dpi, set_send_sprite_to_gpu,
     sprite_map_set_layout, sprite_map_set_limits, test_render_line,
@@ -64,7 +64,7 @@ class Rendering(BaseTest):
         render_string('ab\u0347\u0305你好|\U0001F601|\U0001F64f|\U0001F63a|')
         text = 'He\u0347\u0305llo\u0341, w\u0302or\u0306l\u0354d!'
         # macOS has no fonts capable of rendering combining chars
-        if isosx:
+        if is_macos:
             text = text.encode('ascii', 'ignore').decode('ascii')
         cells = render_string(text)[-1]
         self.ae(len(cells), len(text.encode('ascii', 'ignore')))
diff --git a/setup.py b/setup.py
index a78dfe461..e118494b1 100755
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@ version = tuple(
     )
 )
 _plat = sys.platform.lower()
-isosx = 'darwin' in _plat
+is_macos = 'darwin' in _plat
 is_travis = os.environ.get('TRAVIS') == 'true'
 env = None
 
@@ -74,7 +74,7 @@ def at_least_version(package, major, minor=0):
 
 
 def cc_version():
-    cc = os.environ.get('CC', 'clang' if isosx else 'gcc')
+    cc = os.environ.get('CC', 'clang' if is_macos else 'gcc')
     raw = subprocess.check_output([cc, '-dumpversion']).decode('utf-8')
     ver = raw.split('.')[:2]
     try:
@@ -197,7 +197,7 @@ def kitty_env():
     cflags.append('-DSECONDARY_VERSION={}'.format(version[1]))
     at_least_version('harfbuzz', 1, 5)
     cflags.extend(pkg_config('libpng', '--cflags-only-I'))
-    if isosx:
+    if is_macos:
         font_libs = ['-framework', 'CoreText', '-framework', 'CoreGraphics']
         cflags.extend(pkg_config('freetype2', '--cflags-only-I'))
         font_libs += pkg_config('freetype2', '--libs')
@@ -207,12 +207,12 @@ def kitty_env():
     cflags.extend(pkg_config('harfbuzz', '--cflags-only-I'))
     font_libs.extend(pkg_config('harfbuzz', '--libs'))
     pylib = get_python_flags(cflags)
-    gl_libs = ['-framework', 'OpenGL'] if isosx else pkg_config('gl', '--libs')
+    gl_libs = ['-framework', 'OpenGL'] if is_macos else pkg_config('gl', '--libs')
     libpng = pkg_config('libpng', '--libs')
     ans.ldpaths += pylib + font_libs + gl_libs + libpng + [
         '-lunistring'
     ]
-    if isosx:
+    if is_macos:
         ans.ldpaths.extend('-framework Cocoa'.split())
         if is_travis and 'SW' in os.environ:
             cflags.append('-I{}/include'.format(os.environ['SW']))
@@ -369,7 +369,7 @@ def compile_c_extension(kenv, module, incremental, compilation_database, all_key
 def find_c_files():
     ans, headers = [], []
     d = os.path.join(base, 'kitty')
-    exclude = {'fontconfig.c', 'desktop.c'} if isosx else {'core_text.m', 'cocoa_window.m'}
+    exclude = {'fontconfig.c', 'desktop.c'} if is_macos else {'core_text.m', 'cocoa_window.m'}
     for x in os.listdir(d):
         ext = os.path.splitext(x)[1]
         if ext in ('.c', '.m') and os.path.basename(x) not in exclude:
@@ -384,7 +384,7 @@ def find_c_files():
 
 
 def compile_glfw(incremental, compilation_database, all_keys):
-    modules = 'cocoa' if isosx else 'x11 wayland'
+    modules = 'cocoa' if is_macos else 'x11 wayland'
     for module in modules.split():
         try:
             genv = glfw.init_env(env, pkg_config, at_least_version, module)
@@ -440,7 +440,7 @@ def build_asan_launcher(args):
     cc, ccver = cc_version()
     cflags = '-g3 -Wall -Werror -fpie -std=c99'.split()
     pylib = get_python_flags(cflags)
-    sanitize_lib = ['-lasan'] if cc == 'gcc' and not isosx else []
+    sanitize_lib = ['-lasan'] if cc == 'gcc' and not is_macos else []
     cflags.extend(get_sanitize_args(cc, ccver))
     cmd = [cc] + cflags + [src, '-o', dest] + sanitize_lib + pylib
     run_tool(cmd, desc='Creating {} ...'.format(emphasis('asan-launcher')))
@@ -496,7 +496,7 @@ def package(args, for_bundle=False):  # {{{
     launcher_dir = os.path.join(ddir, 'bin')
     safe_makedirs(launcher_dir)
     build_linux_launcher(args, launcher_dir, for_bundle)
-    if not isosx:  # {{{ linux desktop gunk
+    if not is_macos:  # {{{ linux desktop gunk
         icdir = os.path.join(ddir, 'share', 'icons', 'hicolor', '256x256', 'apps')
         safe_makedirs(icdir)
         shutil.copy2('logo/kitty.png', icdir)