diff --git a/src/locking/lock_driver_sanlock.c b/src/locking/lock_driver_sanlock.c
index 3e5f0e37b0..39c2f94a76 100644
--- a/src/locking/lock_driver_sanlock.c
+++ b/src/locking/lock_driver_sanlock.c
@@ -829,8 +829,10 @@ static int virLockManagerSanlockAddResource(virLockManagerPtr lock,
         break;
 
     default:
-        /* Ignore other resources, without error */
-        break;
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Unknown lock manager object type %d for domain lock object"),
+                       type);
+        return -1;
     }
 
     return 0;