diff --git a/src/Orchard.Web/Web.config b/src/Orchard.Web/Web.config
index f86265aeb..5d27e3abe 100644
--- a/src/Orchard.Web/Web.config
+++ b/src/Orchard.Web/Web.config
@@ -93,6 +93,9 @@
   </system.web>
 
   <system.webServer>
+    <!-- prevent iis from only allowing integrated mode configuration -->
+    <validation validateIntegratedModeConfiguration="false" />
+    
     <modules runAllManagedModulesForAllRequests="false">
       <remove name="WarmupHttpModule"/>
       <add name="WarmupHttpModule" type="Orchard.WarmupStarter.WarmupHttpModule, Orchard.WarmupStarter, Version=1.7.2, Culture=neutral"/>