diff --git a/qtcreator.pri b/qtcreator.pri
index 6a59fe91f199b1ab1a7d90d6cb4f4db757fefd73..31d03a5950109a37e7a8e936f46d899923f467f0 100644
--- a/qtcreator.pri
+++ b/qtcreator.pri
@@ -90,7 +90,7 @@ LIBS += -L$$IDE_LIBRARY_PATH
 
 #DEFINES += QT_NO_CAST_FROM_ASCII
 DEFINES += QT_NO_CAST_TO_ASCII
-#DEFINES += QT_USE_FAST_OPERATOR_PLUS QT_USE_FAST_CONCATENATION
+DEFINES += QT_USE_FAST_OPERATOR_PLUS QT_USE_FAST_CONCATENATION
 
 unix {
     CONFIG(debug, debug|release):OBJECTS_DIR = $${OUT_PWD}/.obj/debug-shared
diff --git a/src/libs/qmljs/parser/qmljsgrammar_p.h b/src/libs/qmljs/parser/qmljsgrammar_p.h
index 903e2c4dab63e78f04b7149dba4ff716490f89cb..c2e26935737ee862f25df65e4d62bcc59ec3d54d 100644
--- a/src/libs/qmljs/parser/qmljsgrammar_p.h
+++ b/src/libs/qmljs/parser/qmljsgrammar_p.h
@@ -61,7 +61,7 @@ QT_BEGIN_NAMESPACE
 class QmlJSGrammar
 {
 public:
-  enum {
+  enum VariousConstants {
     EOF_SYMBOL = 0,
     REDUCE_HERE = 99,
     SHIFT_THERE = 98,