diff --git a/network-loadbalancer.cfndsl.rb b/network-loadbalancer.cfndsl.rb
index 4720490..305a45e 100644
--- a/network-loadbalancer.cfndsl.rb
+++ b/network-loadbalancer.cfndsl.rb
@@ -52,7 +52,7 @@
 
     ElasticLoadBalancingV2_TargetGroup("#{tg_name}TargetGroup") {
       VpcId Ref(:VPCId)
-      Protocol 'TCP'
+      Protocol params.has_key?('protocol') ? params['protocol'] : 'TCP'
       Port params['port']
 
       TargetType params['type'] if params.has_key?('type')