diff --git a/ywsd/objects.py b/ywsd/objects.py
index 4ce29fb..a535e76 100644
--- a/ywsd/objects.py
+++ b/ywsd/objects.py
@@ -178,7 +178,8 @@ class ActiveCall:
     async def is_active_call(cls, username, x_eventphone_id, db_connection):
         return (
             await db_connection.scalar(
-                cls.table.count()
+                sa.select(sa.func.count('*'))
+                .select_from(cls.table)
                 .where(cls.table.c.username == username)
                 .where(cls.table.c.x_eventphone_id == x_eventphone_id)
             )