diff --git a/src/arch/LowLevelWindow/LowLevelWindow_MacOSX.mm b/src/arch/LowLevelWindow/LowLevelWindow_MacOSX.mm
index 491f133439..75e692ea17 100644
--- a/src/arch/LowLevelWindow/LowLevelWindow_MacOSX.mm
+++ b/src/arch/LowLevelWindow/LowLevelWindow_MacOSX.mm
@@ -96,7 +96,7 @@ public:
 	[m_Window setExcludedFromWindowsMenu:YES];
 	[m_Window useOptimizedDrawing:YES];
 	[m_Window setReleasedWhenClosed:NO];
-	[m_Window setDelegate:self];
+	[m_Window setDelegate:static_cast<id<NSWindowDelegate> >(self)];
 }
 
 - (void) closeWindow