diff --git a/src/Umbraco.Web/Trees/TreeControllerBase.cs b/src/Umbraco.Web/Trees/TreeControllerBase.cs
index 4e43e6c093..a815364982 100644
--- a/src/Umbraco.Web/Trees/TreeControllerBase.cs
+++ b/src/Umbraco.Web/Trees/TreeControllerBase.cs
@@ -366,7 +366,7 @@ namespace Umbraco.Web.Trees
         /// <returns></returns>
         protected bool IsDialog(FormDataCollection queryStrings)
         {
-            return queryStrings.GetValue<bool>(TreeQueryStringParameters.IsDialog);
+            return queryStrings.GetValue<string>(TreeQueryStringParameters.Use) == "dialog";
         }
 
         /// <summary>
diff --git a/src/Umbraco.Web/Trees/TreeQueryStringParameters.cs b/src/Umbraco.Web/Trees/TreeQueryStringParameters.cs
index 205871ca20..466aff5a1f 100644
--- a/src/Umbraco.Web/Trees/TreeQueryStringParameters.cs
+++ b/src/Umbraco.Web/Trees/TreeQueryStringParameters.cs
@@ -5,7 +5,7 @@
     /// </summary>
     internal struct TreeQueryStringParameters
     {
-        public const string IsDialog = "isDialog";
+        public const string Use = "use";
         public const string Application = "application";
         public const string StartNodeId = "startNodeId";
         //public const string OnNodeClick = "OnNodeClick";