diff --git a/src/shared/clang/clang_installation.pri b/src/shared/clang/clang_installation.pri
index d9279155b34..f34bf3fcf8c 100644
--- a/src/shared/clang/clang_installation.pri
+++ b/src/shared/clang/clang_installation.pri
@@ -99,4 +99,4 @@ isEmpty(LLVM_VERSION): error("Cannot determine clang version at $$LLVM_INSTALL_D
     error("LLVM/Clang version >= 3.8.0 required, version provided: $$LLVM_VERSION")
 }
 
-unix:LLVM_CXXFLAGS = -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
+unix:LLVM_CXXFLAGS = -fno-rtti -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
diff --git a/src/tools/clangrefactoringbackend/clangrefactoringbackend.pro b/src/tools/clangrefactoringbackend/clangrefactoringbackend.pro
index 76021fa18ec..7312f543426 100644
--- a/src/tools/clangrefactoringbackend/clangrefactoringbackend.pro
+++ b/src/tools/clangrefactoringbackend/clangrefactoringbackend.pro
@@ -11,7 +11,7 @@ QT -= gui
 LIBS += $$LIBTOOLING_LIBS
 INCLUDEPATH += $$LLVM_INCLUDEPATH
 
-QMAKE_CXXFLAGS += $$LLVM_CXXFLAGS
+QMAKE_CXXFLAGS += $$QMAKE_CXXFLAGS_RTTI_OFF $$LLVM_CXXFLAGS
 
 SOURCES += \
     clangrefactoringbackendmain.cpp