diff --git a/setup.py b/setup.py
index 99ded8d6c..f751107f9 100755
--- a/setup.py
+++ b/setup.py
@@ -301,14 +301,14 @@ def init_env(
     cppflags = shlex.split(cppflags_)
     for el in extra_logging:
         cppflags.append('-DDEBUG_{}'.format(el.upper().replace('-', '_')))
-    werror = '' if ignore_compiler_warnings else '-Werror'
+    werror = '' if ignore_compiler_warnings else '-pedantic-errors -Werror'
     std = '' if is_openbsd else '-std=c11'
     sanitize_flag = ' '.join(sanitize_args)
     march = '-march=native' if native_optimizations else ''
     cflags_ = os.environ.get(
         'OVERRIDE_CFLAGS', (
             f'-Wextra {float_conversion} -Wno-missing-field-initializers -Wall -Wstrict-prototypes {std}'
-            f' -pedantic-errors {werror} {optimize} {sanitize_flag} -fwrapv {stack_protector} {missing_braces}'
+            f' {werror} {optimize} {sanitize_flag} -fwrapv {stack_protector} {missing_braces}'
             f' -pipe {march} -fvisibility=hidden {fortify_source}'
         )
     )