diff --git a/src/plugins/cpptools/cpptools.pro b/src/plugins/cpptools/cpptools.pro
index 74112379e3904c195bdc5431077e08c6ec32a9b2..170f62b5bf19f348f34f5474fd6d2d5e47ab7216 100644
--- a/src/plugins/cpptools/cpptools.pro
+++ b/src/plugins/cpptools/cpptools.pro
@@ -6,7 +6,6 @@ include(cpptools_dependencies.pri)
 
 # DEFINES += QT_NO_CAST_FROM_ASCII
 DEFINES += QT_NO_CAST_TO_ASCII
-unix:QMAKE_CXXFLAGS_DEBUG += -O3
 INCLUDEPATH += .
 DEFINES += CPPTOOLS_LIBRARY
 CONFIG += help