diff --git a/src/Microsoft.AspNetCore.Routing/MapRouteRouteBuilderExtensions.cs b/src/Microsoft.AspNetCore.Routing/MapRouteRouteBuilderExtensions.cs
index d3cc115e6d..ef55007af3 100644
--- a/src/Microsoft.AspNetCore.Routing/MapRouteRouteBuilderExtensions.cs
+++ b/src/Microsoft.AspNetCore.Routing/MapRouteRouteBuilderExtensions.cs
@@ -104,7 +104,7 @@ namespace Microsoft.AspNetCore.Builder
         {
             if (routeBuilder.DefaultHandler == null)
             {
-                throw new RouteCreationException(Resources.DefaultHandler_MustBeSet);
+                throw new RouteCreationException(Resources.FormatDefaultHandler_MustBeSet(nameof(IRouteBuilder)));
             }
 
             var inlineConstraintResolver = routeBuilder
diff --git a/src/Microsoft.AspNetCore.Routing/Properties/Resources.Designer.cs b/src/Microsoft.AspNetCore.Routing/Properties/Resources.Designer.cs
index 9dd91e7f85..efc7928b7c 100644
--- a/src/Microsoft.AspNetCore.Routing/Properties/Resources.Designer.cs
+++ b/src/Microsoft.AspNetCore.Routing/Properties/Resources.Designer.cs
@@ -75,7 +75,7 @@ namespace Microsoft.AspNetCore.Routing
         }
 
         /// <summary>
-        /// A default handler must be set on the RouteCollection.
+        /// A default handler must be set on the {0}.
         /// </summary>
         internal static string DefaultHandler_MustBeSet
         {
@@ -83,11 +83,11 @@ namespace Microsoft.AspNetCore.Routing
         }
 
         /// <summary>
-        /// A default handler must be set on the RouteCollection.
+        /// A default handler must be set on the {0}.
         /// </summary>
-        internal static string FormatDefaultHandler_MustBeSet()
+        internal static string FormatDefaultHandler_MustBeSet(object p0)
         {
-            return GetString("DefaultHandler_MustBeSet");
+            return string.Format(CultureInfo.CurrentCulture, GetString("DefaultHandler_MustBeSet"), p0);
         }
 
         /// <summary>
diff --git a/src/Microsoft.AspNetCore.Routing/Resources.resx b/src/Microsoft.AspNetCore.Routing/Resources.resx
index 6af7dff663..6c3fcc582b 100644
--- a/src/Microsoft.AspNetCore.Routing/Resources.resx
+++ b/src/Microsoft.AspNetCore.Routing/Resources.resx
@@ -130,7 +130,7 @@
     <value>The supplied route name '{0}' is ambiguous and matched more than one route.</value>
   </data>
   <data name="DefaultHandler_MustBeSet" xml:space="preserve">
-    <value>A default handler must be set on the RouteCollection.</value>
+    <value>A default handler must be set on the {0}.</value>
   </data>
   <data name="DefaultInlineConstraintResolver_AmbiguousCtors" xml:space="preserve">
     <value>The constructor to use for activating the constraint type '{0}' is ambiguous. Multiple constructors were found with the following number of parameters: {1}.</value>