diff --git a/testhal/STM32/STM32F1xx/UART/main.c b/testhal/STM32/STM32F1xx/UART/main.c
index 96ab4ab73..76542baac 100644
--- a/testhal/STM32/STM32F1xx/UART/main.c
+++ b/testhal/STM32/STM32F1xx/UART/main.c
@@ -104,6 +104,7 @@ static UARTConfig uart_cfg_1 = {
   rxend,
   rxchar,
   rxerr,
+  NULL,
   38400,
   0,
   USART_CR2_LINEN,
diff --git a/testhal/STM32/STM32L1xx/UART/main.c b/testhal/STM32/STM32L1xx/UART/main.c
index 72d9291af..e716695a3 100644
--- a/testhal/STM32/STM32L1xx/UART/main.c
+++ b/testhal/STM32/STM32L1xx/UART/main.c
@@ -100,6 +100,7 @@ static UARTConfig uart_cfg_1 = {
   rxend,
   rxchar,
   rxerr,
+  NULL,
   38400,
   0,
   USART_CR2_LINEN,