diff --git a/nix/colorshell.nix b/nix/colorshell.nix
index 3b21840..ab8a6ce 100644
--- a/nix/colorshell.nix
+++ b/nix/colorshell.nix
@@ -28,8 +28,8 @@ let
       lib.fileset.unions [
         ../flake.nix
         ../flake.lock
-        ../result
-        ../build
+        (lib.fileset.maybeMissing ../result)
+        (lib.fileset.maybeMissing ../build)
         ./.
       ]
     );