diff --git a/os/hal/platforms/STM32/uart_lld.c b/os/hal/platforms/STM32/uart_lld.c
index 5d5f323f1..9769aa090 100644
--- a/os/hal/platforms/STM32/uart_lld.c
+++ b/os/hal/platforms/STM32/uart_lld.c
@@ -243,7 +243,7 @@ CH_IRQ_HANDLER(DMA1_Ch5_IRQHandler) {
     /* Receiver in idle state, a callback is generated, if enabled, for each
        received character and then the driver stays in the same state.*/
     if (uartp->ud_config->uc_rxchar != NULL)
-      uartp->ud_config->uc_rxchar(uartp->ud_rxbuf);
+      uartp->ud_config->uc_rxchar(uartp, uartp->ud_rxbuf);
   }
   else {
     /* Receiver in active state, a callback is generated, if enabled, after
@@ -379,7 +379,7 @@ CH_IRQ_HANDLER(DMA1_Ch3_IRQHandler) {
     /* Receiver in idle state, a callback is generated, if enabled, for each
        received character and then the driver stays in the same state.*/
     if (uartp->ud_config->uc_rxchar != NULL)
-      uartp->ud_config->uc_rxchar(uartp->ud_rxbuf);
+      uartp->ud_config->uc_rxchar(uartp, uartp->ud_rxbuf);
   }
   else {
     /* Receiver in active state, a callback is generated, if enabled, after
@@ -463,11 +463,11 @@ void uart_lld_init(void) {
   RCC->APB1RSTR     = RCC_APB1RSTR_USART3RST;
   RCC->APB1RSTR     = 0;
   uartObjectInit(&UARTD3);
-  UARTD2.ud_usart   = USART3;
-  UARTD2.ud_dmap    = STM32_DMA1;
-  UARTD2.ud_dmarx   = STM32_DMA_CHANNEL_3;
-  UARTD2.ud_dmatx   = STM32_DMA_CHANNEL_2;
-  UARTD2.ud_dmaccr  = 0;
+  UARTD3.ud_usart   = USART3;
+  UARTD3.ud_dmap    = STM32_DMA1;
+  UARTD3.ud_dmarx   = STM32_DMA_CHANNEL_3;
+  UARTD3.ud_dmatx   = STM32_DMA_CHANNEL_2;
+  UARTD3.ud_dmaccr  = 0;
 #endif
 }
 
diff --git a/readme.txt b/readme.txt
index 02ccbe50e..ae61387dc 100644
--- a/readme.txt
+++ b/readme.txt
@@ -65,6 +65,7 @@
 *****************************************************************************
 
 *** 2.1.7 ***
+- FIX: Fixed error in STM32 unbuffered UART driver (bug 3153437).
 - FIX: Fixed wrong macro check in LPC214x driver (bug 3152510).
 - FIX: Fixed switch condition error in STM32 PWM driver (bug 3152482)
   (backported to 2.0.10).