diff --git a/make-pages/Depend.hs b/make-pages/Depend.hs
index 4713fbe..03f320b 100644
--- a/make-pages/Depend.hs
+++ b/make-pages/Depend.hs
@@ -128,4 +128,6 @@ thumbFile :: FilePath -> FilePath
 thumbFile = addSuffix "_small"
 
 pageFile :: FilePath -> FilePath
-pageFile = addSuffix "_med"
+pageFile f
+  | takeExtension f == ".gif" = f
+  | otherwise                 = addSuffix "_med" f