diff --git a/sysutils/and/Makefile b/sysutils/and/Makefile
index ab3f1a8818ef..f62f6e22303d 100644
--- a/sysutils/and/Makefile
+++ b/sysutils/and/Makefile
@@ -19,7 +19,7 @@ NOPRECIOUSMAKEVARS=	yes
 
 .include <bsd.port.pre.mk>
 
-.if ${OSVERSION} >= 1100095
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1100095
 post-patch:
 	@${REINPLACE_CMD} "s,P_KTHREAD,P_KPROC,g" \
 		${WRKSRC}/Makefile ${WRKSRC}/and-OpenBSD.c