diff --git a/util-linux/mount.c b/util-linux/mount.c
index 5539f1e02..57d2d0430 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -515,7 +515,7 @@ static const struct {
 static char *nfs_strerror(int status)
 {
 	int i;
-	static char buf[256];
+	static char buf[sizeof("unknown nfs status return value: ") + sizeof(int)*3];
 
 	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
 		if (nfs_errtbl[i].stat == status)