diff --git a/flake.nix b/flake.nix
index e42514d..c3bd57d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -47,7 +47,7 @@
           src = lib.sourceFilesBySuffices ./. [
             "Cargo.toml"
             "Cargo.lock"
-            "*.rs"
+            ".rs"
           ];
         };