diff --git a/drivers/staging/lustre/lustre/mgc/mgc_request.c b/drivers/staging/lustre/lustre/mgc/mgc_request.c
index 6894d4c1e5cc..b9c522a3c7a4 100644
--- a/drivers/staging/lustre/lustre/mgc/mgc_request.c
+++ b/drivers/staging/lustre/lustre/mgc/mgc_request.c
@@ -375,7 +375,7 @@ out_err:
 	return rc;
 }
 
-DEFINE_MUTEX(llog_process_lock);
+static DEFINE_MUTEX(llog_process_lock);
 
 /** Stop watching for updates on this log.
  */