diff --git a/flake.nix b/flake.nix
index 4cfe7d9..3fabe0f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -46,6 +46,8 @@
       in
       {
         devShell = pkgs.mkShell {
+          RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
+
           buildInputs = with pkgs; [
             cargo
             rustc