diff --git a/api/chalicelib/utils/s3.py b/api/chalicelib/utils/s3.py
index 8a2369647..655628602 100644
--- a/api/chalicelib/utils/s3.py
+++ b/api/chalicelib/utils/s3.py
@@ -17,7 +17,7 @@ else:
                           aws_secret_access_key=config("S3_SECRET"),
                           config=Config(signature_version='s3v4'),
                           region_name=config("sessions_region"),
-                          verify=(False if config("S3_DISABLE_SSL_VERIFY") else True))
+                          verify=not config("S3_DISABLE_SSL_VERIFY", default=False, cast=bool))
 
 
 def __get_s3_resource():
@@ -28,7 +28,7 @@ def __get_s3_resource():
                           aws_secret_access_key=config("S3_SECRET"),
                           config=Config(signature_version='s3v4'),
                           region_name=config("sessions_region"),
-                          verify=(False if config("S3_DISABLE_SSL_VERIFY") else True))
+                          verify=not config("S3_DISABLE_SSL_VERIFY", default=False, cast=bool))
 
 
 def exists(bucket, key):
@@ -83,7 +83,8 @@ def get_presigned_url_for_upload_secure(bucket, expires_in, key, conditions=None
         Conditions=conditions,
     )
     req = PreparedRequest()
-    req.prepare_url(f"{url_parts['url']}/{url_parts['fields']['key']}", url_parts['fields'])
+    req.prepare_url(
+        f"{url_parts['url']}/{url_parts['fields']['key']}", url_parts['fields'])
     return req.url
 
 
@@ -103,7 +104,8 @@ def get_file(source_bucket, source_key):
 
 def rename(source_bucket, source_key, target_bucket, target_key):
     s3 = __get_s3_resource()
-    s3.Object(target_bucket, target_key).copy_from(CopySource=f'{source_bucket}/{source_key}')
+    s3.Object(target_bucket, target_key).copy_from(
+        CopySource=f'{source_bucket}/{source_key}')
     s3.Object(source_bucket, source_key).delete()