diff --git a/src/MacVim/MMVimController.m b/src/MacVim/MMVimController.m
index 324bab7c85..80ad17752a 100644
--- a/src/MacVim/MMVimController.m
+++ b/src/MacVim/MMVimController.m
@@ -1523,10 +1523,15 @@ static BOOL isUnsafeMessage(int msgid);
         }
     }
 
+#if MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_10
+  [alert beginSheetModalForWindow:[windowController window]
+                completionHandler: ^(NSModalResponse code) { [self alertDidEnd:alert code:code context:NULL]; }];
+#else
     [alert beginSheetModalForWindow:[windowController window]
                       modalDelegate:self
                      didEndSelector:@selector(alertDidEnd:code:context:)
                         contextInfo:NULL];
+#endif
 
     [alert release];
 }