diff --git a/make-pages/Depend.hs b/make-pages/Depend.hs
index ed04f0a..4ccb7e1 100644
--- a/make-pages/Depend.hs
+++ b/make-pages/Depend.hs
@@ -1,26 +1,27 @@
 module Depend where
 
+import BuildVar
 import Info hiding (Text)
-import Data.Foldable
-import System.FilePath
+
+import Data.Maybe (fromMaybe)
 import Data.Text.Lazy (Text)
 import Data.Text.Lazy.Builder (toLazyText)
-import BuildVar
+import System.FilePath
 
 
 dependSingle' :: FilePath -- ^ yaml file name (relative to data dir!)
               -> Info
+              -> FilePath -- ^ output prefix
               -> FilePath -- ^ build dir
               -> Bool     -- ^ include nsfw?
               -> Text
-dependSingle' yaml info build nsfw =
-  let dir    = build </> takeDirectory yaml
+dependSingle' yaml info prefix build nsfw =
+  let dir    = build </> prefix </> takeDirectory yaml
       images = if nsfw then #images info else filter #sfw $ #images info
       paths  = map #path images
       index  = dir </> "index.html"
-      deps   = map (dir </>) $
-               thumbFile (thumbnail info) : map pageFile paths ++ paths
-      deps'  = unwords deps
+      deps   = thumbFile (thumbnail info) : map pageFile paths ++ paths
+      deps'  = unwords $ map (dir </>) deps
   in
   toLazyText [b|$@index: $@deps'|]