diff --git a/radio/src/targets/taranis/extmodule_driver.cpp b/radio/src/targets/taranis/extmodule_driver.cpp
index 72da992ca..1b3959083 100644
--- a/radio/src/targets/taranis/extmodule_driver.cpp
+++ b/radio/src/targets/taranis/extmodule_driver.cpp
@@ -181,6 +181,8 @@ void extmoduleSendBuffer(const uint8_t * data, uint8_t size)
 #define USART_FLAG_ERRORS (USART_FLAG_ORE | USART_FLAG_NE | USART_FLAG_FE | USART_FLAG_PE)
 extern "C" void EXTMODULE_USART_IRQHandler(void)
 {
+  TRACE_NOCRLF("I");
+
   uint32_t status = EXTMODULE_USART->SR;
 
   while (status & (USART_FLAG_RXNE | USART_FLAG_ERRORS)) {