diff --git a/flake.nix b/flake.nix
index c4ef5a6..bfc71d8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -40,6 +40,7 @@
           src = craneLib.path ./.;
           filter = path: type:
             (pkgs.lib.hasSuffix "\.md" path) ||
+            (pkgs.lib.hasSuffix "\.stpl" path) ||
             (craneLib.filterCargoSources path type)
           ;
         };