diff --git a/src/vty/command.c b/src/vty/command.c
index b38be34..4825109 100644
--- a/src/vty/command.c
+++ b/src/vty/command.c
@@ -727,7 +727,7 @@
 			char flag;
 
 			/* Skip attribute if *not* set */
-			if (~cmd->usrattr & (1 << i))
+			if (~cmd->usrattr & ((unsigned)1 << i))
 				continue;
 
 			xml_att_desc = xml_escape(desc[i]);