diff --git a/webots/controllers/RL_Supervisor/rl_supervisor.py b/webots/controllers/RL_Supervisor/rl_supervisor.py
index 4c9e14e3..244f6340 100644
--- a/webots/controllers/RL_Supervisor/rl_supervisor.py
+++ b/webots/controllers/RL_Supervisor/rl_supervisor.py
@@ -7,7 +7,7 @@
 import sys
 import struct
 from controller import Supervisor  # pylint: disable=import-error
-from Serial_webots import SerialWebots
+from serial_webots import SerialWebots
 from SerialMuxProt import Server
 
 # Constants