diff --git a/util.cs b/util.cs
index a9de86c..4c191bb 100644
--- a/util.cs
+++ b/util.cs
@@ -440,13 +440,13 @@ namespace raven_integration
             if (shouldContainInMessage != null)
             {
                 a.ObjectResponse["error"]["details"].Should().Contain(
-                    m => m["target"].Value<string>() == target &&
-                    m["error"].Value<string>() == error &&
-                    m["message"].Value<string>().Contains(shouldContainInMessage));
+                    z => z["target"].Value<string>() == target &&
+                    z["error"].Value<string>() == error &&
+                    z["message"].Value<string>().Contains(shouldContainInMessage));
             }
             else
             {
-                a.ObjectResponse["error"]["details"].Should().Contain(m => m["target"].Value<string>() == target && m["error"].Value<string>() == error);
+                a.ObjectResponse["error"]["details"].Should().Contain(z => z["target"].Value<string>() == target && z["error"].Value<string>() == error);
             }
         }