diff --git a/radio/src/opentx.h b/radio/src/opentx.h
index 44c5e3ca0..e36d5f6a0 100644
--- a/radio/src/opentx.h
+++ b/radio/src/opentx.h
@@ -398,7 +398,7 @@ extern uint8_t channel_order(uint8_t x);
 constexpr uint8_t HEART_TIMER_10MS = 0x01;
 constexpr uint8_t HEART_TIMER_PULSES = 0x02; // when multiple modules this is the first one
 #if defined(HARDWARE_INTERNAL_MODULE)
-constexpr uint8_t HEART_WDT_CHECK = HEART_TIMER_10MS + (HEART_TIMER_PULSES << INTERNAL_MODULE) + (HEART_TIMER_PULSES << EXTERNAL_MODOULE);
+constexpr uint8_t HEART_WDT_CHECK = HEART_TIMER_10MS + (HEART_TIMER_PULSES << INTERNAL_MODULE) + (HEART_TIMER_PULSES << EXTERNAL_MODULE);
 #else
 constexpr uint8_t HEART_WDT_CHECK = HEART_TIMER_10MS + (HEART_TIMER_PULSES << EXTERNAL_MODULE);
 #endif