diff --git a/glfw/cocoa_window.m b/glfw/cocoa_window.m
index a6880327d..b3f01b40f 100644
--- a/glfw/cocoa_window.m
+++ b/glfw/cocoa_window.m
@@ -667,7 +667,7 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
 
 // Delegate for application related notifications {{{
 
-@interface GLFWApplicationDelegate : NSObject
+@interface GLFWApplicationDelegate : NSObject <NSApplicationDelegate>
 @end
 
 @implementation GLFWApplicationDelegate