diff --git a/source/frontends/mariani/EmulatorViewController.mm b/source/frontends/mariani/EmulatorViewController.mm
index 1e1d62ed6..5326d39df 100644
--- a/source/frontends/mariani/EmulatorViewController.mm
+++ b/source/frontends/mariani/EmulatorViewController.mm
@@ -133,7 +133,7 @@ - (void)rebuildView:(BOOL)notify {
     _view.enableSetNeedsDisplay = NO;
     _view.device = MTLCreateSystemDefaultDevice();
     _view.numericKeyDelegate = self;
-#ifdef DEBUG
+#ifdef DEBUG_BLUE_BACKGROUND
     //  useful for debugging quad sizing issues.
     _view.clearColor = MTLClearColorMake(0.0, 0.15, 0.3, 0.3);
 #endif