diff --git a/pkgs/development/compilers/rust/make-rust-platform.nix b/pkgs/development/compilers/rust/make-rust-platform.nix
index 2071c48cc6d5..b859d01dc085 100644
--- a/pkgs/development/compilers/rust/make-rust-platform.nix
+++ b/pkgs/development/compilers/rust/make-rust-platform.nix
@@ -1,4 +1,4 @@
-{ buildPackages, callPackage, stdenv }@prev:
+{ buildPackages, callPackage, stdenv, runCommand }@prev:
 
 { rustc, cargo, stdenv ? prev.stdenv, ... }:
 
@@ -21,11 +21,11 @@ rec {
   importCargoLock = buildPackages.callPackage ../../../build-support/rust/import-cargo-lock.nix {};
 
   rustcSrc = callPackage ./rust-src.nix {
-    inherit stdenv rustc;
+    inherit runCommand rustc;
   };
 
   rustLibSrc = callPackage ./rust-lib-src.nix {
-    inherit stdenv rustc;
+    inherit runCommand rustc;
   };
 
   # Hooks
diff --git a/pkgs/development/compilers/rust/rust-lib-src.nix b/pkgs/development/compilers/rust/rust-lib-src.nix
index 67a7fa3641ad..aa914338639d 100644
--- a/pkgs/development/compilers/rust/rust-lib-src.nix
+++ b/pkgs/development/compilers/rust/rust-lib-src.nix
@@ -1,11 +1,6 @@
-{ stdenv, rustc }:
+{ runCommand, rustc }:
 
-stdenv.mkDerivation {
-  name = "rust-lib-src";
-  src = rustc.src;
-  phases = [ "unpackPhase" "installPhase" ];
-
-  installPhase = ''
-    mv library $out
-  '';
-}
+runCommand "rust-lib-src" { } ''
+  tar --strip-components=1 -xzf ${rustc.src}
+  mv library $out
+''
diff --git a/pkgs/development/compilers/rust/rust-src.nix b/pkgs/development/compilers/rust/rust-src.nix
index 4239e92b0363..69bdb37ac2fd 100644
--- a/pkgs/development/compilers/rust/rust-src.nix
+++ b/pkgs/development/compilers/rust/rust-src.nix
@@ -1,25 +1,21 @@
-{ lib, stdenv, rustc, minimalContent ? true }:
+{ lib, runCommand, rustc, minimalContent ? true }:
 
-stdenv.mkDerivation {
-  name = "rust-src";
-  src = rustc.src;
-  phases = [ "unpackPhase" "installPhase" ];
-  installPhase = ''
-    mv src $out
-    rm -rf $out/{${lib.concatStringsSep "," ([
-      "ci"
-      "doc"
-      "etc"
-      "grammar"
-      "llvm-project"
-      "llvm-emscripten"
-      "rtstartup"
-      "rustllvm"
-      "test"
-      "vendor"
-    ] ++ lib.optionals minimalContent [
-      "tools"
-      "stdarch"
-    ])}}
-  '';
-}
+runCommand "rust-src" { } ''
+  tar -xzf ${rustc.src}
+  mv rustc-${rustc.version}-src $out
+  rm -rf $out/{${lib.concatStringsSep "," ([
+    "ci"
+    "doc"
+    "etc"
+    "grammar"
+    "llvm-project"
+    "llvm-emscripten"
+    "rtstartup"
+    "rustllvm"
+    "test"
+    "vendor"
+  ] ++ lib.optionals minimalContent [
+    "tools"
+    "stdarch"
+  ])}}
+''