diff --git a/BaseTools/Source/C/Makefiles/header.makefile b/BaseTools/Source/C/Makefiles/header.makefile
index bcc2791998..1bf003523b 100644
--- a/BaseTools/Source/C/Makefiles/header.makefile
+++ b/BaseTools/Source/C/Makefiles/header.makefile
@@ -106,7 +106,7 @@ endif
 endif
 ifneq ($(CLANG),)
 LDFLAGS =
-CXXFLAGS = -Wno-deprecated-register -Wno-unused-result
+CXXFLAGS = -Wno-deprecated-register -Wno-unused-result -std=c++14
 else
 LDFLAGS =
 CXXFLAGS = -Wno-unused-result