diff --git a/math/moo/Makefile b/math/moo/Makefile
index 3433139fcf4b..b3e2d9e992fa 100644
--- a/math/moo/Makefile
+++ b/math/moo/Makefile
@@ -17,7 +17,7 @@ GH_TAGNAME=	${PORTVERSION}
 
 PLIST_FILES=	bin/moo man/man1/moo.1.gz
 
-.if exists(/usr/include/sys/capsicum.h)
+.if exists(/usr/include/sys/capsicum.h) && exists(/usr/include/capsicum_helpers.h)
 CFLAGS+=	-DHAVE_CAPSICUM
 .endif