diff --git a/src/lib/platform/OSXDragView.m b/src/lib/platform/OSXDragView.m
index e1873b4a..2b03df1a 100644
--- a/src/lib/platform/OSXDragView.m
+++ b/src/lib/platform/OSXDragView.m
@@ -135,7 +135,7 @@ draggingSourceOperationMask
 
 - (NSInteger)draggingSequenceNumber
 {
-	return nil;
+	return 0;
 }
 
 - (void)slideDraggedImageTo:(NSPoint)screenPoint