diff --git a/lib/utils.js b/lib/utils.js
index afa30d3..4ed9bd0 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -5,7 +5,7 @@ const METHOD_PROPS = ['name', 'options', 'type', 'requestStream', 'responseStrea
   'requestName', 'responseName', 'path', 'requestType', 'responseType', 'originalName']
 
 function getCallTypeFromCall (call) {
-  const name = Object.getPrototypeOf(call)?.constructor?.name ?? ''
+  const name = Object.getPrototypeOf(call).constructor.name
 
   if (name.indexOf('ServerUnaryCall') === 0) {
     return CallType.UNARY