diff --git a/flake.nix b/flake.nix
index 55a1b003..84cfb830 100644
--- a/flake.nix
+++ b/flake.nix
@@ -39,7 +39,7 @@
                   (
                     final: prev:
                     let
-                      toolchain = final.rust-bin.stable.latest.default.override { extensions = [ "rust-src" ]; };
+                      toolchain = final.rust-bin.stable.latest.default;
                     in
                     {
                       rustPlatform = prev.makeRustPlatform {
diff --git a/nix/shell.nix b/nix/shell.nix
index 361fbcfe..a6750e43 100644
--- a/nix/shell.nix
+++ b/nix/shell.nix
@@ -10,6 +10,7 @@ mainPkg.overrideAttrs (oa: {
   nativeBuildInputs = [
     (rust-bin.stable.latest.default.override {
       extensions = [
+        "rust-src"
         "rustfmt"
         "rust-analyzer"
         "clippy"