diff --git a/recipe_engine/internal/commands/bundle/cmd.py b/recipe_engine/internal/commands/bundle/cmd.py
index 962f514..e87fa5a 100644
--- a/recipe_engine/internal/commands/bundle/cmd.py
+++ b/recipe_engine/internal/commands/bundle/cmd.py
@@ -153,10 +153,12 @@
 
 # pylint: disable=line-too-long
 TEMPLATE3_SH = """#!/usr/bin/env bash
+export PYTHONPATH=${BASH_SOURCE[0]%/*}/recipe_engine
 exec vpython3 -u ${BASH_SOURCE[0]%/*}/recipe_engine/recipe_engine/main.py
 """.strip()
 
 TEMPLATE3_BAT = """@echo off
+set PYTHONPATH="%~dp0\\recipe_engine"
 call vpython3.bat -u "%~dp0\\recipe_engine\\recipe_engine\\main.py"
 """.strip()
 # pylint: enable=line-too-long
diff --git a/recipes.py b/recipes.py
index 05ca941..c6ef83a 100755
--- a/recipes.py
+++ b/recipes.py
@@ -235,13 +235,10 @@
   if not shutil.which(vpython):
     return f'Required binary is not found on PATH: {vpython}'
 
-  # We unset PYTHONPATH here in case the user has conflicting environmental
-  # things we don't want them to leak through into the recipe_engine which
-  # manages its environment entirely via vpython.
-  #
-  # NOTE: os.unsetenv unhelpfully doesn't exist on all platforms until python3.9
-  # so we have to use the cutesy `pop` formulation below until then...
-  os.environ.pop("PYTHONPATH", None)
+  # We overwrite PYTHONPATH here on purpose; We don't want any conflicting
+  # environmental path leaking through into the recipe_engine which manages its
+  # environment entirely via vpython.
+  os.environ['PYTHONPATH'] = engine_path
 
   spec = '.vpython3'
   debugger = os.environ.get('RECIPE_DEBUGGER', '')