diff --git a/shell.nix b/shell.nix
index af22215..59bbdc9 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,6 +1,7 @@
 let
   sources = import ./nix/sources.nix;
-  pkgs = import sources.nixpkgs { };
+  pkgs =
+    import sources.nixpkgs { overlays = [ (import sources.nixpkgs-mozilla) ]; };
   dhallpkgs = import sources.easy-dhall-nix { inherit pkgs; };
   dhall-yaml = dhallpkgs.dhall-yaml-simple;
   dhall = dhallpkgs.dhall-simple;
@@ -33,5 +34,7 @@ mkShell {
   CLACK_SET = "Ashlynn,Terry Davis,Dennis Ritchie";
   RUST_LOG = "debug";
   RUST_BACKTRACE = "1";
+  RUST_SRC_PATH =
+    "${pkgs.latest.rustChannels.nightly.rust-src}/lib/rustlib/src/rust/library";
   GITHUB_SHA = "devel";
 }