diff --git a/fs/9p/error.c b/fs/9p/error.c
index ae91555c1558..0d7fa4e08812 100644
--- a/fs/9p/error.c
+++ b/fs/9p/error.c
@@ -83,6 +83,7 @@ int v9fs_errstr2errno(char *errstr, int len)
 
 	if (errno == 0) {
 		/* TODO: if error isn't found, add it dynamically */
+		errstr[len] = 0;
 		printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
 		       errstr);
 		errno = 1;