diff --git a/pkgs/by-name/in/ingen/package.nix b/pkgs/by-name/in/ingen/package.nix
index 81bd40c8207a..f4668ea2f31d 100644
--- a/pkgs/by-name/in/ingen/package.nix
+++ b/pkgs/by-name/in/ingen/package.nix
@@ -61,7 +61,7 @@ stdenv.mkDerivation {
   ];
 
   postInstall = ''
-    wrapPythonProgramsIn "$out/bin" "$out $pythonPath"
+    wrapPythonProgramsIn "$out/bin" "$out ''${pythonPath[*]}"
     wrapProgram "$out/bin/ingen" --set INGEN_UI_PATH "$out/share/ingen/ingen_gui.ui"
   '';