diff --git a/flake.nix b/flake.nix
index 4c5db8bfaae..5125dad06be 100644
--- a/flake.nix
+++ b/flake.nix
@@ -81,7 +81,7 @@
           # Custom filter with various file extensions that we rely upon to build packages
           # Currently: `.nr`, `.sol`, `.sh`, `.json`, `.md` and `.wasm`
           filter = path: type:
-            (builtins.match ".*\.(nr|sol|sh|json|md|wasm)$" path != null) || (craneLib.filterCargoSources path type);
+            (builtins.match ".*\.(nr|sol|sh|json|md|wasm|txt)$" path != null) || (craneLib.filterCargoSources path type);
         };
 
         # TODO(#1198): It'd be nice to include these flags when running `cargo clippy` in a devShell.