diff --git a/program/serializers.py b/program/serializers.py
index 185559e30f1a39a898f1d15d1a03f1c8224408fd..4a13478fcb221312eb8ce40fa6ee119e449c48f3 100644
--- a/program/serializers.py
+++ b/program/serializers.py
@@ -338,7 +338,7 @@ class HostSerializer(serializers.ModelSerializer):
     )
     links = HostLinkSerializer(many=True, required=False)
     owner_ids = serializers.PrimaryKeyRelatedField(
-        allow_null=True, many=True, queryset=User.objects.all(), source="owners"
+        many=True, queryset=User.objects.all(), source="owners"
     )
 
     class Meta: