diff --git a/pkgs/by-name/rt/rt-tests/package.nix b/pkgs/by-name/rt/rt-tests/package.nix
index 692763c6d74a..c8f430119cc6 100644
--- a/pkgs/by-name/rt/rt-tests/package.nix
+++ b/pkgs/by-name/rt/rt-tests/package.nix
@@ -26,6 +26,8 @@ stdenv.mkDerivation rec {
     "prefix=$(out)"
     "DESTDIR="
     "PYLIB=$(out)/${python3.sitePackages}"
+    "CC=${stdenv.cc.targetPrefix}cc"
+    "AR=${stdenv.cc.bintools.targetPrefix}ar"
   ];
 
   postInstall = ''