diff --git a/xCAT-server/lib/xcat/plugins/ivm.pm b/xCAT-server/lib/xcat/plugins/ivm.pm
index 34e50e6a7..77628b706 100644
--- a/xCAT-server/lib/xcat/plugins/ivm.pm
+++ b/xCAT-server/lib/xcat/plugins/ivm.pm
@@ -164,7 +164,7 @@ sub gethmccon {
 	    $host = $att->{hcp};
 	}
 	my @cred = xCAT::PPCdb::credentials( $host, $hwtype );
-	if ( !defined(@cred) )
+	if ( !(@cred) )
 	{
         $rsp->{node}->[0]->{error}=["Can't username and passwd for the ivm"];
         $rsp->{node}->[0]->{errorcode}=[1];