diff --git a/xCAT-server/sbin/xcatd b/xCAT-server/sbin/xcatd
index 34db9e1d4..d0d23dd98 100755
--- a/xCAT-server/sbin/xcatd
+++ b/xCAT-server/sbin/xcatd
@@ -621,7 +621,7 @@ until ($quit) {
   }
 
   if ($child == 0) {
-    $SIG{TERM} = $SIG{INT} = ();
+    $SIG{TERM} = $SIG{INT} = {};
     $SIG{CHLD} = \&generic_reaper; #THROTTLE
     $listener->close;