diff --git a/pkgs/development/interpreters/elixir/generic-builder.nix b/pkgs/development/interpreters/elixir/generic-builder.nix
index af6982156103..9007ab12d754 100644
--- a/pkgs/development/interpreters/elixir/generic-builder.nix
+++ b/pkgs/development/interpreters/elixir/generic-builder.nix
@@ -50,14 +50,14 @@ stdenv.mkDerivation ({
     # to PATH so the scripts can run without problems.
 
     for f in $out/bin/*; do
-     b=$(basename $f)
+      b=$(basename $f)
       if [ "$b" = mix ]; then continue; fi
       wrapProgram $f \
         --prefix PATH ":" "${lib.makeBinPath [ erlang coreutils curl bash ]}"
     done
 
     substituteInPlace $out/bin/mix \
-          --replace "/usr/bin/env elixir" "${coreutils}/bin/env elixir"
+      --replace "/usr/bin/env elixir" "${coreutils}/bin/env $out/bin/elixir"
   '';
 
   pos = builtins.unsafeGetAttrPos "sha256" args;