diff --git a/src/meds/schema.py b/src/meds/schema.py
index 1fd82de..0c1e73d 100644
--- a/src/meds/schema.py
+++ b/src/meds/schema.py
@@ -131,7 +131,7 @@ def code_metadata_schema(custom_per_code_properties=[]):
         [
             ("code", pa.string()),
             ("description", pa.string()),
-            ("parent_codes", pa.list(pa.string()),
+            ("parent_codes", pa.list(pa.string())),
         ] + custom_per_code_properties
     )