diff --git a/Oqtane.Client/Themes/Controls/Theme/LoginBase.cs b/Oqtane.Client/Themes/Controls/Theme/LoginBase.cs
index fc41f5659..7d7d575c8 100644
--- a/Oqtane.Client/Themes/Controls/Theme/LoginBase.cs
+++ b/Oqtane.Client/Themes/Controls/Theme/LoginBase.cs
@@ -52,7 +52,7 @@ protected override void OnParametersSet()
             else
             {
                 // use existing value
-                loginurl = "?returnurl=" + PageState.QueryString["returnurl"];
+                loginurl += "?returnurl=" + PageState.QueryString["returnurl"];
             }
 
             // set logout url