diff --git a/pkgs/build-support/pkg-config-wrapper/default.nix b/pkgs/build-support/pkg-config-wrapper/default.nix
index ca14a4495fed..f68597662608 100644
--- a/pkgs/build-support/pkg-config-wrapper/default.nix
+++ b/pkgs/build-support/pkg-config-wrapper/default.nix
@@ -46,14 +46,11 @@ stdenv.mkDerivation {
   strictDeps = true;
   dontBuild = true;
   dontConfigure = true;
+  dontUnpack = true;
 
   # Additional flags passed to pkg-config.
   addFlags = lib.optional stdenv.targetPlatform.isStatic "--static";
 
-  unpackPhase = ''
-    src=$PWD
-  '';
-
   installPhase =
     ''
       mkdir -p $out/bin $out/nix-support