diff --git a/neutron/agent/l3/agent.py b/neutron/agent/l3/agent.py
index 5b0e14f35d9..0a968bdfb57 100644
--- a/neutron/agent/l3/agent.py
+++ b/neutron/agent/l3/agent.py
@@ -876,7 +876,7 @@ class L3NATAgent(ha.AgentMixin,
         except oslo_messaging.MessagingTimeout:
             if self.sync_routers_chunk_size > SYNC_ROUTERS_MIN_CHUNK_SIZE:
                 self.sync_routers_chunk_size = max(
-                    self.sync_routers_chunk_size / 2,
+                    self.sync_routers_chunk_size // 2,
                     SYNC_ROUTERS_MIN_CHUNK_SIZE)
                 LOG.error('Server failed to return info for routers in '
                           'required time, decreasing chunk size to: %s',