diff --git a/Octokit/Clients/Enterprise/EnterpriseProbe.cs b/Octokit/Clients/Enterprise/EnterpriseProbe.cs
index 3584825ea6..1d963b38b8 100644
--- a/Octokit/Clients/Enterprise/EnterpriseProbe.cs
+++ b/Octokit/Clients/Enterprise/EnterpriseProbe.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Net;
 using System.Net.Http;
 using System.Text.RegularExpressions;
@@ -103,7 +104,8 @@ public async Task<EnterpriseProbeResult> Probe(Uri enterpriseBaseUrl)
 
         static bool IsEnterpriseResponse(IResponse response)
         {
-            return response.Headers.ContainsKey("X-GitHub-Request-Id");
+            // Use fix from https://github.com/octokit/octokit.net/pull/2175
+            return response.Headers.Any(h => string.Equals(h.Key, "X-GitHub-Request-Id", StringComparison.OrdinalIgnoreCase));
         }
     }
 
@@ -125,4 +127,4 @@ public enum EnterpriseProbeResult
         /// </summary>
         Failed
     }
-}
+}
\ No newline at end of file