diff --git a/share/mk/sys.mk b/share/mk/sys.mk
--- a/share/mk/sys.mk
+++ b/share/mk/sys.mk
@@ -321,7 +321,7 @@
 # the ports files are modernized, and a reasonable transition
 # period has passed, include it while we're in a ports tree here
 # to preserve historic behavior.
-.if exists(${.CURDIR}/../../Mk/bsd.port.mk)
+.if exists(${.CURDIR}/../../Mk/Uses)
 .include <bsd.cpu.mk>
 .endif