diff --git a/source/Makefile b/source/Makefile
index f75c8f8f1..e011f8f57 100644
--- a/source/Makefile
+++ b/source/Makefile
@@ -117,7 +117,7 @@ endif
 # clang用にCPPFLAGSなどを変更
 ifneq (,$(findstring clang++,$(COMPILER)))
 	# stdlib
-	CPPFLAGS += -stdlib=libstdc++
+	#CPPFLAGS += -stdlib=libstdc++
 
 	# C++17のfilesystem
 	# LDFLAGS += -lstdc++fs