1 files changed, 2 insertions, 0 deletions
diff --git a/libmaple/usart.h b/libmaple/usart.h
index 0ca3f55..90b3415 100644
--- a/libmaple/usart.h
+++ b/libmaple/usart.h
@@ -43,8 +43,10 @@ enum {
     USART1,
     USART2,
     USART3,
+#ifdef STM32_HIGH_DENSITY
     UART4,
     UART5,
+#endif
 };
 
 /* peripheral register struct  */