diff --git a/glfw/cocoa_window.m b/glfw/cocoa_window.m
index f41c96115..d45592871 100644
--- a/glfw/cocoa_window.m
+++ b/glfw/cocoa_window.m
@@ -2004,7 +2004,7 @@ void _glfwPlatformSetCursor(_GLFWwindow* window, _GLFWcursor* cursor)
 bool _glfwPlatformToggleFullscreen(_GLFWwindow* w, unsigned int flags) {
     NSWindow *window = w->ns.object;
     bool made_fullscreen = true;
-    bool traditional = flags & 1;
+    bool traditional = !(flags & 1);
     NSWindowStyleMask sm = [window styleMask];
     bool in_fullscreen = sm & NSWindowStyleMaskFullScreen;
     if (traditional) {
diff --git a/kitty/glfw.c b/kitty/glfw.c
index 93acaced4..0c33e5037 100644
--- a/kitty/glfw.c
+++ b/kitty/glfw.c
@@ -364,7 +364,7 @@ do_toggle_fullscreen(OSWindow *w) {
     int width, height, x, y;
     glfwGetWindowSize(w->handle, &width, &height);
     glfwGetWindowPos(w->handle, &x, &y);
-    if (glfwToggleFullscreen(w->handle, 1)) {
+    if (glfwToggleFullscreen(w->handle, 0)) {
         w->before_fullscreen.is_set = true;
         w->before_fullscreen.w = width; w->before_fullscreen.h = height; w->before_fullscreen.x = x; w->before_fullscreen.y = y;
         return true;
@@ -380,7 +380,7 @@ static bool
 toggle_fullscreen_for_os_window(OSWindow *w) {
     if (w && w->handle) {
 #ifdef __APPLE__
-    if (!OPT(macos_traditional_fullscreen)) return glfwToggleFullscreen(w->handle, 0);
+    if (!OPT(macos_traditional_fullscreen)) return glfwToggleFullscreen(w->handle, 1);
 #endif
     return do_toggle_fullscreen(w);
     }