diff --git a/pkgs/python-vars-with-env/codegen.py b/pkgs/python-vars-with-env/codegen.py
index d957128..07f5b05 100755
--- a/pkgs/python-vars-with-env/codegen.py
+++ b/pkgs/python-vars-with-env/codegen.py
@@ -9,8 +9,8 @@ PROLOGUE = (
     "import functools as _functools\n"
     "@_functools.cache\n"
     "def _read_file(name):\n"
-    "    with open(name) as f:\n"
-    "        return name\n"
+    "    with open(name) as fd:\n"
+    "        return fd.read()\n"
 )