diff --git a/ports/nrf/boards/arduino_primo/nrf52_hal_conf.h b/ports/nrf/boards/arduino_primo/nrf52_hal_conf.h
index 585506b8d6..fd6073a187 100644
--- a/ports/nrf/boards/arduino_primo/nrf52_hal_conf.h
+++ b/ports/nrf/boards/arduino_primo/nrf52_hal_conf.h
@@ -10,6 +10,7 @@
 #define HAL_TWI_MODULE_ENABLED
 #define HAL_ADCE_MODULE_ENABLED
 #define HAL_TEMP_MODULE_ENABLED
+#define HAL_RNG_MODULE_ENABLED
 // #define HAL_UARTE_MODULE_ENABLED
 // #define HAL_SPIE_MODULE_ENABLED
 // #define HAL_TWIE_MODULE_ENABLED