diff --git a/byg/src/DependencyGenerator.hs b/byg/src/DependencyGenerator.hs
index 4950cd2..cecbe17 100644
--- a/byg/src/DependencyGenerator.hs
+++ b/byg/src/DependencyGenerator.hs
@@ -279,4 +279,6 @@ hasExtension exts filename = do
   ext `elemOf` exts
 
 copyTo :: (TokenableTo FilePath a, TokenableTo FilePath b) => a -> b -> DepGenM ()
-copyTo path targetDir = copyFile path (joinPaths targetDir path)
+copyTo path targetDir = do
+  pathToken <- toToken path
+  copyFile pathToken (joinPaths targetDir pathToken)