diff --git a/libs/gtkmm2ext/gtkapplication_quartz.mm b/libs/gtkmm2ext/gtkapplication_quartz.mm
index 045db98a95..3e89e643d3 100644
--- a/libs/gtkmm2ext/gtkapplication_quartz.mm
+++ b/libs/gtkmm2ext/gtkapplication_quartz.mm
@@ -1424,11 +1424,13 @@ namespace Gtk {
 
 @end
 
-@interface GtkApplicationDelegate : NSObject {}
+@interface GtkApplicationDelegate : NSObject 
+-(BOOL) application:(NSApplication*) app openFile:(NSString*) file;
+- (NSApplicationTerminateReply) applicationShouldTerminate:(NSApplication *) app;
 @end
 
 @implementation GtkApplicationDelegate
--(BOOL) application:(NSApplication*) app :(NSString*) file
+-(BOOL) application:(NSApplication*) app openFile:(NSString*) file
 {
 	UNUSED_PARAMETER(app);
 	Glib::ustring utf8_path ([file UTF8String]);