diff --git a/pkgs/by-name/mi/mininet/package.nix b/pkgs/by-name/mi/mininet/package.nix
index 9550417068e6..5f57a874aa91 100644
--- a/pkgs/by-name/mi/mininet/package.nix
+++ b/pkgs/by-name/mi/mininet/package.nix
@@ -85,7 +85,7 @@ stdenv.mkDerivation rec {
   '';
 
   postFixup = ''
-    wrapPythonProgramsIn "$out/bin" "$py $pythonPath"
+    wrapPythonProgramsIn "$out/bin" "$py ''${pythonPath[*]}"
     wrapProgram "$out/bin/mnexec" \
       --prefix PATH : "${generatedPath}"
     wrapProgram "$out/bin/mn" \