diff --git a/src/shared/clang/clang_installation.pri b/src/shared/clang/clang_installation.pri
index 8c3922c01ba..d9279155b34 100644
--- a/src/shared/clang/clang_installation.pri
+++ b/src/shared/clang/clang_installation.pri
@@ -98,3 +98,5 @@ isEmpty(LLVM_VERSION): error("Cannot determine clang version at $$LLVM_INSTALL_D
 !versionIsAtLeast($$LLVM_VERSION, 3, 8, 0): {
     error("LLVM/Clang version >= 3.8.0 required, version provided: $$LLVM_VERSION")
 }
+
+unix:LLVM_CXXFLAGS = -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
diff --git a/src/tools/clangrefactoringbackend/clangrefactoringbackend.pro b/src/tools/clangrefactoringbackend/clangrefactoringbackend.pro
index 64bdba68aa4..76021fa18ec 100644
--- a/src/tools/clangrefactoringbackend/clangrefactoringbackend.pro
+++ b/src/tools/clangrefactoringbackend/clangrefactoringbackend.pro
@@ -11,6 +11,8 @@ QT -= gui
 LIBS += $$LIBTOOLING_LIBS
 INCLUDEPATH += $$LLVM_INCLUDEPATH
 
+QMAKE_CXXFLAGS += $$LLVM_CXXFLAGS
+
 SOURCES += \
     clangrefactoringbackendmain.cpp