diff --git a/src/pulsatingscience.cpp b/src/pulsatingscience.cpp
index 5ad367fdcc2a582051c3248583fa6f94983ec80c..209c5c5729934d49b3cc8ec8ec0acebc05848f9e 100644
--- a/src/pulsatingscience.cpp
+++ b/src/pulsatingscience.cpp
@@ -450,7 +450,7 @@ void PulsatingScience::toggleHiddenDemoMode()
 	if(m_hiddenDemoModeActivated) {
 #ifdef __APPLE__
 		// show Menubar & Dock
-		SetSystemUIMode(kUIModeNormal, 0);
+		// unavailable in Qt 4.6: SetSystemUIMode(kUIModeNormal, 0);
 		window()->setWindowFlags(windowFlags()
 							   & ~Qt::FramelessWindowHint
 							   & ~Qt::WindowStaysOnTopHint);
@@ -467,8 +467,8 @@ void PulsatingScience::toggleHiddenDemoMode()
 	else {
 #ifdef __APPLE__
 		// hide Menubar & Dock
-		SetSystemUIMode(kUIModeAllHidden, 0);
-		// don't ever ask my why this works _only_ in exactly this order on the Mac
+        // unavailable in Qt 4.6: SetSystemUIMode(kUIModeAllHidden, 0);
+		// don't ever ask me why this works _only_ in exactly this order on the Mac
 		window()->setWindowFlags(windowFlags()
 					 | Qt::FramelessWindowHint
 					 | Qt::WindowStaysOnTopHint);