diff --git a/drivers/block/drbd/drbd_proc.c b/drivers/block/drbd/drbd_proc.c
index bf31d41dbaadf023a57057bb03006c77146c7879..84fbe33908e2301daeab6aa1043ab6b8599e2ffa 100644
--- a/drivers/block/drbd/drbd_proc.c
+++ b/drivers/block/drbd/drbd_proc.c
@@ -46,7 +46,7 @@ const struct file_operations drbd_proc_fops = {
 	.release	= drbd_proc_release,
 };
 
-void seq_printf_with_thousands_grouping(struct seq_file *seq, long v)
+static void seq_printf_with_thousands_grouping(struct seq_file *seq, long v)
 {
 	/* v is in kB/sec. We don't expect TiByte/sec yet. */
 	if (unlikely(v >= 1000000)) {