diff --git a/pkgs/os-specific/linux/radeontop/default.nix b/pkgs/os-specific/linux/radeontop/default.nix
index 2cb82dc3c02a..9e9cb5845e4e 100644
--- a/pkgs/os-specific/linux/radeontop/default.nix
+++ b/pkgs/os-specific/linux/radeontop/default.nix
@@ -19,6 +19,7 @@ stdenv.mkDerivation rec {
 
   patchPhase = ''
     substituteInPlace getver.sh --replace ver=unknown ver=${version}
+    substituteInPlace Makefile --replace pkg-config "$PKG_CONFIG"
   '';
 
   makeFlags = [ "PREFIX=$(out)" ];