diff --git a/usr.bin/atf/atf-sh/Makefile b/usr.bin/atf/atf-sh/Makefile
index 4ebdc33..37ff8fa 100644
--- a/usr.bin/atf/atf-sh/Makefile
+++ b/usr.bin/atf/atf-sh/Makefile
@@ -33,8 +33,8 @@ PROG_CXX=	atf-sh
 SRCS=		atf-sh.cpp
 MAN=            atf-sh.1 atf-sh-api.3
 
-CFLAGS+=	-DHAVE_CONFIG_H
-CFLAGS+=	-I${ATF}
+CXXFLAGS+=	-DHAVE_CONFIG_H
+CXXFLAGS+=	-I${ATF}
 
 DPADD+=		${LIBATF_C} ${LIBATF_CXX}
 LDADD+=		-latf-c++ -latf-c