diff --git a/pkgs/development/compilers/rust/make-rust-platform.nix b/pkgs/development/compilers/rust/make-rust-platform.nix
index 29a7e5f95194..1f69bb92e213 100644
--- a/pkgs/development/compilers/rust/make-rust-platform.nix
+++ b/pkgs/development/compilers/rust/make-rust-platform.nix
@@ -51,6 +51,12 @@
         inherit runCommand rustc;
       };
 
+      # Useful when rebuilding std
+      # e.g. when building wasm with wasm-pack
+      rustVendorSrc = callPackage ./rust-vendor-src.nix {
+        inherit runCommand rustc;
+      };
+
       # Hooks
       inherit
         (callPackages ../../../build-support/rust/hooks {
diff --git a/pkgs/development/compilers/rust/rust-vendor-src.nix b/pkgs/development/compilers/rust/rust-vendor-src.nix
new file mode 100644
index 000000000000..18d9922e1c6c
--- /dev/null
+++ b/pkgs/development/compilers/rust/rust-vendor-src.nix
@@ -0,0 +1,6 @@
+{ runCommand, rustc }:
+
+runCommand "rust-vendor-src" { } ''
+  tar --strip-components=1 -xzf ${rustc.src}
+  mv vendor $out
+''