diff --git a/flake.nix b/flake.nix
index dd3e596..a7d98e9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -38,6 +38,9 @@
             # least on macOS
             pkgs.libiconv
           ];
+
+          RUST_SRC_PATH =
+            "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
         };
       });
 }