diff --git a/model/driver/nrf24l01.dfa b/model/driver/nrf24l01.dfa
index 787f429b64cb40e0a182e64b397d58ace6708438..43c4b2f12b8e9acc8d60f7f1a6ed6aa558cc06a5 100644
--- a/model/driver/nrf24l01.dfa
+++ b/model/driver/nrf24l01.dfa
@@ -28,6 +28,9 @@ parameter_normalization:
       Nrf24l01::RF24_1MBPS: 1000
       Nrf24l01::RF24_2MBPS: 2000
       Nrf24l01::RF24_250KBPS: 250
+  retry_delay:
+    unit: us
+    formula: '250 * param + 250'
 
 states:
   - UNINITIALIZED