diff --git a/src/VaccineDistributionByZipcodeSimplifier.py b/src/VaccineDistributionByZipcodeSimplifier.py
index 564e9dfb7e9..62b9bbf6bae 100644
--- a/src/VaccineDistributionByZipcodeSimplifier.py
+++ b/src/VaccineDistributionByZipcodeSimplifier.py
@@ -6,5 +6,5 @@ class VaccineDistributionByZipcodeSimplifier:
     def sumDoses(vaccineDistributionByZipcode):
         return (vaccineDistributionByZipcode
                 .groupby(['PROVIDER_NAME', 'ZIPCODE_SHP', 'LOT_NUMBER'])
-                .agg(DOSES_SHIPPED = pd.NamedAgg(column = 'DOSES_SHIPPED', aggfunc = 'sum'))
+                .agg(DOSES_SHIPPED = pd.NamedAgg(column = 'DOSES_SHIPPED', aggfunc = sum))
                 .reset_index())