diff --git a/src/PSR7/SpecFinder.php b/src/PSR7/SpecFinder.php
index 8d586895..2b0a5030 100644
--- a/src/PSR7/SpecFinder.php
+++ b/src/PSR7/SpecFinder.php
@@ -211,6 +211,10 @@ public function findResponseSpec($addr): ResponseSpec
 
         $response = $operation->responses->getResponse((string) $addr->responseCode());
 
+        if(! $response){
+            $response = $operation->responses->getResponse(substr($addr->responseCode(),0,1) . 'XX');
+        }
+        
         if (! $response) {
             $response = $operation->responses->getResponse('default');
         }