diff --git a/sys/src/9/port/portmkfile b/sys/src/9/port/portmkfile
index 0253999d5..7b0c14053 100644
--- a/sys/src/9/port/portmkfile
+++ b/sys/src/9/port/portmkfile
@@ -30,7 +30,7 @@ all:V:
 		mk 'CONF='$i
 
 clean:V:
-	rm -f *.[$OS] *.root.s *.rootc.c cfs.h fs.h init.h conf.h *.out *.m errstr.h rootfs.bz2
+	rm -f *.[$OS] *.i *.root.s *.rootc.c cfs.h fs.h init.h conf.h *.out *.m errstr.h rootfs.bz2
 	for(i in $CONFLIST $CRAPLIST)
 		mk $i.clean