diff --git a/libs/aws/reverse-proxy/update-proxy.ts b/libs/aws/reverse-proxy/update-proxy.ts
index 4154679f3f17e621727499a148f7e63d697a9164..8835482b9c23628d2721fc37c9d7d311a7963ed8 100644
--- a/libs/aws/reverse-proxy/update-proxy.ts
+++ b/libs/aws/reverse-proxy/update-proxy.ts
@@ -81,7 +81,7 @@ export function updateProxy(props: UpdateProxyProps): cr.AwsCustomResource {
     stackName,
   };
 
-  const onDeleteSdkCall = sdkCall;
+  const onDeleteSdkCall = {...sdkCall};
   onDeleteSdkCall.parameters.Message = JSON.stringify(onDeleteMessage);
 
   return new cr.AwsCustomResource(props.scope, `${props.id}SnsReverseProxy`, {