diff --git a/src/widgets/stylehelper.cpp b/src/widgets/stylehelper.cpp
index c8937ba74..f4884d78e 100644
--- a/src/widgets/stylehelper.cpp
+++ b/src/widgets/stylehelper.cpp
@@ -57,7 +57,7 @@ static int clamp(float x) {
 namespace Utils {
 
 qreal StyleHelper::sidebarFontSize() {
-#if defined(Q_WS_MAC)
+#if defined(Q_OS_MACOS)
   return 10;
 #else
   return 7.5;