diff --git a/os_brick/initiator/linuxscsi.py b/os_brick/initiator/linuxscsi.py
index 9387d92..6e7b9ce 100644
--- a/os_brick/initiator/linuxscsi.py
+++ b/os_brick/initiator/linuxscsi.py
@@ -436,6 +436,8 @@ class LinuxSCSI(executor.Executor):
         return processed
 
     def _format_lun_id(self, lun_id):
+        # make sure lun_id is an int
+        lun_id = int(lun_id)
         if lun_id < 256:
             return lun_id
         else: