diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index 0acecbd..5d22c03 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -68,7 +68,7 @@
  * semaphore to serialise link/link calls to prevent two link calls in parallel
  * introducing a cycle
  */
-DECLARE_RWSEM(keyring_serialise_link_sem);
+static DECLARE_RWSEM(keyring_serialise_link_sem);
 
 /*****************************************************************************/
 /*