diff --git a/x11/fluxbg/Makefile b/x11/fluxbg/Makefile
index 9aadb6f361fe..a10349e2827a 100644
--- a/x11/fluxbg/Makefile
+++ b/x11/fluxbg/Makefile
@@ -27,7 +27,7 @@ post-patch:
 
 .include <bsd.port.pre.mk>
 
-.if ${OSVERSION} < 1100077
+.if ${OPSYS} == FreeBSD && ${OSVERSION} < 1100077
 # chmod -R bug
 post-extract:
 	${CHMOD} +x ${WRKSRC}/autom4te.cache