diff --git a/cpu/sam0_common/include/periph_cpu_common.h b/cpu/sam0_common/include/periph_cpu_common.h
index 495a031399..b23ff27c56 100644
--- a/cpu/sam0_common/include/periph_cpu_common.h
+++ b/cpu/sam0_common/include/periph_cpu_common.h
@@ -192,8 +192,8 @@ typedef enum {
 /**
  * @brief   Size of the UART TX buffer for non-blocking mode.
  */
-#ifndef SAM0_UART_TXBUF_SIZE
-#define SAM0_UART_TXBUF_SIZE    (64)
+#ifndef UART_TXBUF_SIZE
+#define UART_TXBUF_SIZE    (64)
 #endif
 
 /**
diff --git a/cpu/sam0_common/periph/uart.c b/cpu/sam0_common/periph/uart.c
index 41ebccec1d..624f872ab3 100644
--- a/cpu/sam0_common/periph/uart.c
+++ b/cpu/sam0_common/periph/uart.c
@@ -41,7 +41,7 @@
 #ifdef MODULE_PERIPH_UART_NONBLOCKING
 #include "tsrb.h"
 static tsrb_t uart_tx_rb[UART_NUMOF];
-static uint8_t uart_tx_rb_buf[UART_NUMOF][SAM0_UART_TXBUF_SIZE];
+static uint8_t uart_tx_rb_buf[UART_NUMOF][UART_TXBUF_SIZE];
 #endif
 static uart_isr_ctx_t uart_ctx[UART_NUMOF];
 
@@ -68,7 +68,7 @@ int uart_init(uart_t uart, uint32_t baudrate, uart_rx_cb_t rx_cb, void *arg)
 
 #ifdef MODULE_PERIPH_UART_NONBLOCKING
     /* set up the TX buffer */
-    tsrb_init(&uart_tx_rb[uart], uart_tx_rb_buf[uart], SAM0_UART_TXBUF_SIZE);
+    tsrb_init(&uart_tx_rb[uart], uart_tx_rb_buf[uart], UART_TXBUF_SIZE);
 #endif
 
     /* configure pins */
diff --git a/cpu/stm32/include/periph_cpu.h b/cpu/stm32/include/periph_cpu.h
index 2b3f6e60a3..c9bc9f1007 100644
--- a/cpu/stm32/include/periph_cpu.h
+++ b/cpu/stm32/include/periph_cpu.h
@@ -550,8 +550,8 @@ typedef enum {
 /**
  * @brief   Size of the UART TX buffer for non-blocking mode.
  */
-#ifndef STM32_UART_TXBUF_SIZE
-#define STM32_UART_TXBUF_SIZE    (64)
+#ifndef UART_TXBUF_SIZE
+#define UART_TXBUF_SIZE    (64)
 #endif
 
 #ifndef DOXYGEN
diff --git a/cpu/stm32/periph/uart.c b/cpu/stm32/periph/uart.c
index 36b207ad87..34aabfa7d9 100644
--- a/cpu/stm32/periph/uart.c
+++ b/cpu/stm32/periph/uart.c
@@ -61,7 +61,7 @@
  * @brief   Allocate for tx ring buffers
  */
 static tsrb_t uart_tx_rb[UART_NUMOF];
-static uint8_t uart_tx_rb_buf[UART_NUMOF][STM32_UART_TXBUF_SIZE];
+static uint8_t uart_tx_rb_buf[UART_NUMOF][UART_TXBUF_SIZE];
 #endif
 
 /**
@@ -168,7 +168,7 @@ int uart_init(uart_t uart, uint32_t baudrate, uart_rx_cb_t rx_cb, void *arg)
 
 #ifdef MODULE_PERIPH_UART_NONBLOCKING
     /* set up the TX buffer */
-    tsrb_init(&uart_tx_rb[uart], uart_tx_rb_buf[uart], STM32_UART_TXBUF_SIZE);
+    tsrb_init(&uart_tx_rb[uart], uart_tx_rb_buf[uart], UART_TXBUF_SIZE);
 #endif
 
     uart_init_pins(uart, rx_cb);