diff --git a/cookiecutter/hooks.py b/cookiecutter/hooks.py
index 34214334b..a2f279de8 100644
--- a/cookiecutter/hooks.py
+++ b/cookiecutter/hooks.py
@@ -159,7 +159,7 @@ def get_hooks_env(cwd='.', hooks_dir='hooks'):
     hooks_env = os.environ.copy()
 
     PYTHONPATH = hooks_env.get('PYTHONPATH', '')
-    hooks_env[str('PYTHONPATH')] = str('{0}:{1}'.format(
-        os.path.join(os.path.dirname(cwd), hooks_dir), str(PYTHONPATH)))
+    hooks_env[str('PYTHONPATH')] = str('{0}{1}{2}'.format(
+        os.path.join(os.path.dirname(cwd), hooks_dir), os.pathsep, str(PYTHONPATH)))
 
     return hooks_env