diff --git a/hakyll.cabal b/hakyll.cabal
--- a/hakyll.cabal
+++ b/hakyll.cabal
@@ -1,5 +1,5 @@
 Name:               hakyll
-Version:            3.0.0.2
+Version:            3.0.0.3
 
 Synopsis:           A simple static site generator library.
 Description:        A simple static site generator library, mainly aimed at
diff --git a/src/Hakyll/Web/Feed.hs b/src/Hakyll/Web/Feed.hs
--- a/src/Hakyll/Web/Feed.hs
+++ b/src/Hakyll/Web/Feed.hs
@@ -33,6 +33,7 @@
 import Hakyll.Web.Page.Metadata
 import Hakyll.Web.Template
 import Hakyll.Web.Template.Read.Hakyll (readTemplate)
+import Hakyll.Web.Util.String
 
 import Paths_hakyll
 
@@ -93,7 +94,7 @@
     renderFeed' = unsafeCompiler $ \(items, url) -> do
         feedTemplate' <- loadTemplate feedTemplate
         itemTemplate' <- loadTemplate itemTemplate
-        let url' = fromMaybe noUrl url
+        let url' = toUrl $ fromMaybe noUrl url
         return $ createFeed feedTemplate' itemTemplate' url' configuration items
 
     -- Auxiliary: load a template from a datafile