diff --git a/pkgs/by-name/fa/fast-downward/package.nix b/pkgs/by-name/fa/fast-downward/package.nix
index a3a7d1a48248..7b379a5017c8 100644
--- a/pkgs/by-name/fa/fast-downward/package.nix
+++ b/pkgs/by-name/fa/fast-downward/package.nix
@@ -51,8 +51,8 @@ stdenv.mkDerivation rec {
     mkdir -p $out/${python3.sitePackages}
     cp -r driver $out/${python3.sitePackages}
 
-    wrapPythonProgramsIn $out/bin "$out $pythonPath"
-    wrapPythonProgramsIn $out/libexec/fast-downward/translate "$out $pythonPath"
+    wrapPythonProgramsIn $out/bin "$out ''${pythonPath[*]}"
+    wrapPythonProgramsIn $out/libexec/fast-downward/translate "$out ''${pythonPath[*]}"
     # Because fast-downward calls `python translate.py` we need to return wrapped scripts back.
     for i in $out/libexec/fast-downward/translate/.*-wrapped; do
       name="$(basename "$i")"