diff --git a/ui/drivers/cocoa/apple_platform.h b/ui/drivers/cocoa/apple_platform.h
index 221ce68d88..11860ba450 100644
--- a/ui/drivers/cocoa/apple_platform.h
+++ b/ui/drivers/cocoa/apple_platform.h
@@ -8,20 +8,9 @@
 
 #if defined(HAVE_COCOA_METAL) && !defined(HAVE_COCOATOUCH)
 @interface WindowListener : NSResponder<NSWindowDelegate>
-@end
-
-@implementation WindowListener
-
-/* Similarly to SDL, we'll respond to key events by doing nothing so we don't beep.
- */
-- (void)flagsChanged:(NSEvent *)event { }
-- (void)keyDown:(NSEvent *)event { }
-- (void)keyUp:(NSEvent *)event { }
-
 @end
 #endif
 
-
 #if defined(HAVE_COCOA_METAL) || defined(HAVE_COCOATOUCH)
 @protocol ApplePlatform
 
diff --git a/ui/drivers/cocoa/cocoa_common.m b/ui/drivers/cocoa/cocoa_common.m
index 08d074790f..0654ae3740 100644
--- a/ui/drivers/cocoa/cocoa_common.m
+++ b/ui/drivers/cocoa/cocoa_common.m
@@ -553,3 +553,16 @@ bool cocoa_get_metrics(
    return true;
 }
 #endif
+
+#if defined(HAVE_COCOA_METAL) && !defined(HAVE_COCOATOUCH)
+@implementation WindowListener
+
+/* Similarly to SDL, we'll respond to key events 
+ * by doing nothing so we don't beep.
+ */
+- (void)flagsChanged:(NSEvent *)event { }
+- (void)keyDown:(NSEvent *)event { }
+- (void)keyUp:(NSEvent *)event { }
+
+@end
+#endif