--- a/src/gui/gui.pro
+++ b/src/gui/gui.pro
@@ -80,7 +80,7 @@
     DEFINES += QT_NO_DIRECTWRITE
 }
 
-contains(QMAKE_MAC_XARCH, no) {
+mac:contains(QMAKE_MAC_XARCH, no) {
     DEFINES += QT_NO_MAC_XARCH
 } else {
     win32-g++*|!win32:!win32-icc*:!macx-icc* {