diff --git a/agent/site.py b/agent/site.py
index 6bbb7612..13a363d7 100644
--- a/agent/site.py
+++ b/agent/site.py
@@ -12,7 +12,7 @@
 
 from agent.base import AgentException, Base
 from agent.job import job, step
-from agent.utils import b2mb, get_size
+from agent.utils import b2mb, get_size, cint
 
 if TYPE_CHECKING:
     from agent.bench import Bench
@@ -47,7 +47,7 @@ def __init__(self, name: str, bench: "Bench"):
         self.user = self.config["db_name"]
         self.password = self.config["db_password"]
         self.host = self.config.get("db_host", self.bench.host)
-        self.port = self.config.get("db_port", self.bench.db_port)
+        self.port = cint(self.config.get("db_port", self.bench.db_port))
 
     def bench_execute(self, command, input=None):
         return self.bench.docker_execute(
@@ -505,6 +505,8 @@ def tablewise_backup(self):
             sort_keys=True,
         )
         data = {"tables": {}}
+        db_port = self.config.get("db_port", 3306)
+
         for table in tables:
             backup_file = os.path.join(
                 self.backup_directory, f"{table}.sql.gz"