Use maximumFramesPerSecond only as fallback
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKSwapchain.mm b/MoltenVK/MoltenVK/GPUObjects/MVKSwapchain.mm
index ee7b693..9154d4d 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKSwapchain.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKSwapchain.mm
@@ -439,20 +439,20 @@
 		}
 	}
 
-#if MVK_XCODE_13
-    // macOS 12+ only
-    double framesPerSecond = [screen maximumFramesPerSecond];
-#else
 	CGDirectDisplayID displayId = [[[screen deviceDescription] objectForKey:@"NSScreenNumber"] unsignedIntValue];
 	CGDisplayModeRef mode = CGDisplayCopyDisplayMode(displayId);
 	double framesPerSecond = CGDisplayModeGetRefreshRate(mode);
 	CGDisplayModeRelease(mode);
 
+#if MVK_XCODE_13
+	if (framesPerSecond == 0 && [screen respondsToSelector: @selector(maximumFramesPerSecond)])
+     	framesPerSecond = [screen maximumFramesPerSecond];
+#endif
+
 	// Builtin panels, e.g., on MacBook, report a zero refresh rate.
 	if (framesPerSecond == 0)
 		framesPerSecond = 60.0;
 #endif
-#endif
 
 	pRefreshCycleDuration->refreshDuration = (uint64_t)1e9 / framesPerSecond;
 	return VK_SUCCESS;