diff --git a/http/http_response.hpp b/http/http_response.hpp
index 58a8029..6c842d7 100644
--- a/http/http_response.hpp
+++ b/http/http_response.hpp
@@ -76,7 +76,7 @@
         return stringResponse->result();
     }
 
-    unsigned resultInt()
+    unsigned resultInt() const
     {
         return stringResponse->result_int();
     }