diff --git a/cmake/QtCreatorAPIInternal.cmake b/cmake/QtCreatorAPIInternal.cmake
index 6be35cca1cb..34567dc2e23 100644
--- a/cmake/QtCreatorAPIInternal.cmake
+++ b/cmake/QtCreatorAPIInternal.cmake
@@ -13,8 +13,7 @@ list(APPEND DEFAULT_DEFINES
   QT_NO_JAVA_STYLE_ITERATORS
   QT_NO_CAST_TO_ASCII QT_RESTRICTED_CAST_FROM_ASCII
   QT_DISABLE_DEPRECATED_BEFORE=0x050900
-  QT_USE_FAST_OPERATOR_PLUS
-  QT_USE_FAST_CONCATENATION
+  QT_USE_QSTRINGBUILDER
 )
 
 if (WIN32)