diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 11769b120333..1eae3155e13a 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -16933,13 +16933,10 @@ with pkgs;
   # https://github.com/NixOS/nixpkgs/issues/89426
   rustc-wasm32 = (rustc.override {
     stdenv = stdenv.override {
-      targetPlatform = stdenv.targetPlatform // {
-        parsed = {
-          cpu.name = "wasm32";
-          vendor.name = "unknown";
-          kernel.name = "unknown";
-          abi.name = "unknown";
-        };
+      targetPlatform = lib.systems.elaborate {
+        # lib.systems.elaborate won't recognize "unknown" as the last component.
+        config = "wasm32-unknown-wasi";
+        rust.config = "wasm32-unknown-unknown";
       };
     };
   }).overrideAttrs (old: {