diff --git a/src/Orchard/UI/Resources/ResourceManager.cs b/src/Orchard/UI/Resources/ResourceManager.cs
index 17d7e77a9..7fa8ee080 100644
--- a/src/Orchard/UI/Resources/ResourceManager.cs
+++ b/src/Orchard/UI/Resources/ResourceManager.cs
@@ -131,7 +131,7 @@ namespace Orchard.UI.Resources {
         }
 
         public virtual RequireSettings Include(string resourceType, string resourcePath, string resourceDebugPath) {
-            return Include(resourceType, resourcePath, null, null);
+            return Include(resourceType, resourcePath, resourceDebugPath, null);
         }
 
         public virtual RequireSettings Include(string resourceType, string resourcePath, string resourceDebugPath, string relativeFromPath) {
@@ -142,10 +142,14 @@ namespace Orchard.UI.Resources {
                 throw new ArgumentNullException("resourcePath");
             }
 
+            // ~/ ==> convert to absolute path (e.g. /orchard/..)
             if (VirtualPathUtility.IsAppRelative(resourcePath)) {
-                // ~/ ==> convert to absolute path (e.g. /orchard/..)
                 resourcePath = VirtualPathUtility.ToAbsolute(resourcePath);
             }
+            if (resourceDebugPath != null && VirtualPathUtility.IsAppRelative(resourceDebugPath)) {
+                resourceDebugPath = VirtualPathUtility.ToAbsolute(resourceDebugPath);
+            }
+
             resourcePath = FixPath(resourcePath, relativeFromPath);
             resourceDebugPath = FixPath(resourceDebugPath, relativeFromPath);
             return Require(resourceType, ToAppRelativePath(resourcePath)).Define(d => d.SetUrl(resourcePath, resourceDebugPath));