diff --git a/pkg/util/ipset/ipset.go b/pkg/util/ipset/ipset.go
index 4bc4a739d3..d48d2dd84d 100644
--- a/pkg/util/ipset/ipset.go
+++ b/pkg/util/ipset/ipset.go
@@ -485,7 +485,7 @@ func validateProtocol(protocol string) bool {
 	if protocol == ProtocolTCP || protocol == ProtocolUDP || protocol == ProtocolSCTP {
 		return true
 	}
-	glog.Errorf("Invalid entry's protocol: %s, supported protocols are [%s, %s]", protocol, ProtocolTCP, ProtocolUDP, ProtocolSCTP)
+	glog.Errorf("Invalid entry's protocol: %s, supported protocols are [%s, %s, %s]", protocol, ProtocolTCP, ProtocolUDP, ProtocolSCTP)
 	return false
 }