diff --git a/src/Orchard.Web/Core/Web.config b/src/Orchard.Web/Core/Web.config
index e8cbf2dfb..cabb1bf2a 100644
--- a/src/Orchard.Web/Core/Web.config
+++ b/src/Orchard.Web/Core/Web.config
@@ -2,7 +2,12 @@
 
 <configuration>
 	<system.web>
-		<pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
+    <compilation debug="true" targetFramework="4.0">
+      <assemblies>
+        <add assembly="System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
+      </assemblies>
+    </compilation>
+    <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
 			<namespaces>
 				<add namespace="System.Web.Mvc"/>
 				<add namespace="System.Web.Mvc.Ajax"/>