diff --git a/usr.bin/vgrind/vgrindefs.c b/usr.bin/vgrind/vgrindefs.c
index 729871387bb3..cc6e0c4fa109 100644
--- a/usr.bin/vgrind/vgrindefs.c
+++ b/usr.bin/vgrind/vgrindefs.c
@@ -79,7 +79,7 @@ tgetent(char *bp, char *name, char *file)
 	tbuf = bp;
 	tf = 0;
 	filename = file;
-	tf = open(filename, 0);
+	tf = open(filename, O_RDONLY);
 	if (tf < 0)
 		return (-1);
 	for (;;) {