diff --git a/lib/libproc/Makefile b/lib/libproc/Makefile
index e3b2578..acd76e8 100644
--- a/lib/libproc/Makefile
+++ b/lib/libproc/Makefile
@@ -18,7 +18,7 @@ CFLAGS+=	-I${.CURDIR}
 
 .if ${MK_CXX} == "no"
 CFLAGS+=	-DNO_CXA_DEMANGLE
-.elif ${MK_LIBCPLUSPLUS} != "no"
+.elif ${COMPILER_TYPE} == "clang"
 LIBADD+=		cxxrt
 .else
 LIBADD+=	supcplusplus