diff --git a/src/video/cocoa/cocoa_v.h b/src/video/cocoa/cocoa_v.h
--- a/src/video/cocoa/cocoa_v.h
+++ b/src/video/cocoa/cocoa_v.h
@@ -232,7 +232,17 @@ uint QZ_ListModes(OTTD_Point *modes, uin
 @end
 
 /** Subclass of NSView to fix Quartz rendering and mouse awareness */
-@interface OTTD_CocoaView : NSView <NSTextInput> {
+@interface OTTD_CocoaView : NSView
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
+#	if MAC_OS_X_VERSION_MIN_REQUIRED <= MAC_OS_X_VERSION_10_4
+		<NSTextInputClient, NSTextInput>
+#	else
+		<NSTextInputClient>
+#	endif /* MAC_OS_X_VERSION_MIN_REQUIRED <= MAC_OS_X_VERSION_10_4 */
+#else
+	<NSTextInput>
+#endif /* MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5 */
+{
 	CocoaSubdriver *driver;
 	NSTrackingRectTag trackingtag;
 }