diff --git a/include/libopencm3/stm32/l4/usart.h b/include/libopencm3/stm32/l4/usart.h
index 08d8a86b..7a546f6e 100644
--- a/include/libopencm3/stm32/l4/usart.h
+++ b/include/libopencm3/stm32/l4/usart.h
@@ -37,8 +37,8 @@
 #define USART1				USART1_BASE
 #define USART2				USART2_BASE
 #define USART3				USART3_BASE
-#define UART4				USART4_BASE
-#define UART5				USART5_BASE
+#define UART4				UART4_BASE
+#define UART5				UART5_BASE
 #define LPUART1				LPUART1_BASE
 /**@}*/