diff --git a/src/cocoa_window.m b/src/cocoa_window.m
index f450eda0..043a5f0d 100644
--- a/src/cocoa_window.m
+++ b/src/cocoa_window.m
@@ -363,7 +363,7 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
 // Delegate for application related notifications
 //------------------------------------------------------------------------
 
-@interface GLFWApplicationDelegate : NSObject
+@interface GLFWApplicationDelegate : NSObject <NSApplicationDelegate>
 @end
 
 @implementation GLFWApplicationDelegate