diff --git a/spacy/cli/package.py b/spacy/cli/package.py
index 5894ec049..a5c41adec 100644
--- a/spacy/cli/package.py
+++ b/spacy/cli/package.py
@@ -26,7 +26,7 @@ def package(input_dir, output_dir, force):
     package_path = main_path / model_name
 
     create_dirs(package_path, force)
-    shutil.copytree(input_path, package_path / model_name_v)
+    shutil.copytree((input_path, package_path / model_name_v).as_posix())
     create_file(main_path / 'meta.json', json.dumps(meta, indent=2))
     create_file(main_path / 'setup.py', template_setup)
     create_file(main_path / 'MANIFEST.in', template_manifest)
@@ -48,7 +48,7 @@ def check_dirs(input_path, output_path):
 def create_dirs(package_path, force):
     if package_path.exists():
         if force:
-            shutil.rmtree(package_path)
+            shutil.rmtree(package_path.as_posix())
         else:
             util.sys_exit(package_path.as_posix(),
                 "Please delete the directory and try again.",