diff --git a/main.py b/main.py
index e172d27..d8967a6 100644
--- a/main.py
+++ b/main.py
@@ -6,7 +6,7 @@ def main(host, fablock_id, relais_id):
     client = client = mqtt.Client(f"fablock_client_{fablock_id}_{relais_id}")
 
     client.connect(host)
-    client.publish("fablock/%03d/%03d/trigger".format(fablock_id, relais_id), 0x1)
+    client.publish(f"fablock/{fablock_id:03d}/{relais_id:03d}/trigger", 0x1)
 
 if __name__ == '__main__':
     host = sys.argv[1]
@@ -15,4 +15,4 @@ if __name__ == '__main__':
     state = sys.argv[5]
     
     if(state == "inuse"):
-        main(host, fablock_id, relais_id)
\ No newline at end of file
+        main(host, fablock_id, relais_id)