diff --git a/luigi/contrib/s3.py b/luigi/contrib/s3.py
index b7ed95f278..411d3a1e03 100644
--- a/luigi/contrib/s3.py
+++ b/luigi/contrib/s3.py
@@ -94,6 +94,7 @@ class S3Client(FileSystem):
     """
 
     _s3 = None
+    uses_boto3 = True
 
     def __init__(self, aws_access_key_id=None, aws_secret_access_key=None,
                  **kwargs):
diff --git a/setup.py b/setup.py
index 58b785847e..21600fdeba 100644
--- a/setup.py
+++ b/setup.py
@@ -52,7 +52,7 @@ def get_static_files(path):
 
 setup(
     name='luigi',
-    version='2.7.5+affirm.1.4.8',
+    version='2.7.5+affirm.1.4.9',
     description='Workflow mgmgt + task scheduling + dependency resolution',
     long_description=long_description,
     author='The Luigi Authors',