diff --git a/tests/Makefile b/tests/Makefile
index 0a6010ce..62a80d85 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -195,7 +195,7 @@ checkall:
 	@$(MAKE) clean ; $(MAKE) check CC="gcc -std=c11 -m32 -Werror"
 	@if which clang ; then $(MAKE) clean ; $(MAKE) check CC="clang -std=c99 -Werror" CFLAGS="$(WCFLAGS_CLANG)" ; else echo "SYSTEM CLANG not found: SKIP TEST" ; fi
 	@if which g++ ; then $(MAKE) clean ; $(MAKE) check CC="g++ -std=c++11 -Werror" CFLAGS="$(WCFLAGS_CPP)" ; else echo "SYSTEM G++ not found: SKIP TEST" ; fi
-	@if which clang++ ; then $(MAKE) clean ; $(MAKE) check CC="clang++ -std=c++11 -Werror" CFLAGS="$(WCFLAGS_CLANG)" ; else echo "SYSTEM CLANG++ not found: SKIP TEST" ; fi
+	@if which clang++ ; then $(MAKE) clean ; $(MAKE) check CC="clang++ -std=c++11" CFLAGS="$(WCFLAGS_CLANG)" ; else echo "SYSTEM CLANG++ not found: SKIP TEST" ; fi
 	@if which tcc ; then $(MAKE) clean ; $(MAKE) check CC="tcc -std=c99 -Werror" ; else echo "SYSTEM TCC not found: SKIP TEST" ; fi
 	@if which musl-gcc ; then $(MAKE) clean ; $(MAKE) check CC="musl-gcc -std=c11 -Werror" ; else echo "SYSTEM MUSL-GCC not found: SKIP TEST" ; fi
 	@for f in /opt/gcc* ; do if test -x "$$f/bin/gcc" ; then $(MAKE) clean ; $(MAKE) check CC="$$f/bin/gcc -std=c99 -Werror" ; fi ; done