diff --git a/src/Umbraco.Core/Profiling/WebProfiler.cs b/src/Umbraco.Core/Profiling/WebProfiler.cs
index 51dc650ed4..00d088bca7 100644
--- a/src/Umbraco.Core/Profiling/WebProfiler.cs
+++ b/src/Umbraco.Core/Profiling/WebProfiler.cs
@@ -86,7 +86,7 @@ namespace Umbraco.Core.Profiling
             if (request.Success == false || request.Result.Url.IsClientSideRequest())
                 return false;
 
-            if (string.IsNullOrEmpty(request.Result["umbDebug"]))
+            if (string.IsNullOrEmpty(request.Result.QueryString["umbDebug"]))
                 return true;
 
             if (request.Result.Url.IsBackOfficeRequest(HttpRuntime.AppDomainAppVirtualPath))