diff --git a/src/python/verst/pants/docker/docker_python_bundle_task.py b/src/python/verst/pants/docker/docker_python_bundle_task.py
index d95c5df..b940676 100644
--- a/src/python/verst/pants/docker/docker_python_bundle_task.py
+++ b/src/python/verst/pants/docker/docker_python_bundle_task.py
@@ -45,7 +45,7 @@ def _check_dependency_type(self, dependency):
 
   def _prepare_directory(self, target, dependency, tmpdir):
     archive_mapping = self.context.products.get('pex_archives').get(dependency)
-    basedir, paths = archive_mapping.items()[0]
+    basedir, paths = list(archive_mapping.items())[0]
     path = paths[0]
     archive_path = os.path.join(basedir, path)