diff --git a/pfcwd/main.py b/pfcwd/main.py
index a969eda431ba..c12c93a58c40 100644
--- a/pfcwd/main.py
+++ b/pfcwd/main.py
@@ -359,7 +359,7 @@ def start_default(self):
         port_num = len(list(self.config_db.get_table('PORT').keys()))
 
         # Paramter values positively correlate to the number of ports.
-        multiply = max(1, (port_num-1)/DEFAULT_PORT_NUM+1)
+        multiply = max(1, (port_num-1)//DEFAULT_PORT_NUM+1)
         pfcwd_info = {
             'detection_time': DEFAULT_DETECTION_TIME * multiply,
             'restoration_time': DEFAULT_RESTORATION_TIME * multiply,