diff --git a/common/setup.py b/common/setup.py
index d19a9f75fc..a876d42ae6 100644
--- a/common/setup.py
+++ b/common/setup.py
@@ -31,7 +31,7 @@
         # long as they have a version of pyfoobar equal to or greater than 1.x
         # and less than 2.x installed.
         'flask>=1.0.2',
-        'marshmallow>=2.15.3'
+        'marshmallow>=2.15.3',
         'marshmallow-annotations>=2.4.0'
     ],
     python_requires=">=3.6",