diff --git a/snowman/template/nix/base.nix b/snowman/template/nix/base.nix
index 473d0ccafdbf0be957eea60ca4eced17d67f6352..22bc707008f23a55e3a196e171c316b6470f1252 100644
--- a/snowman/template/nix/base.nix
+++ b/snowman/template/nix/base.nix
@@ -87,9 +87,7 @@ let
         pkgs.haskell.packages.${compilerjs}.callCabal2nix "snowman"
           (filterSource
              (path: _:
-                baseNameOf path == "src"
-                || l.hasSuffix ".hs" path
-                || l.hasSuffix ".cabal" path
+               !(l.hasSuffix ".git" path || l.hasSuffix "result" path)
              )
              ../.
           )