diff --git a/EmbeddedPkg/Library/GdbSerialLib/GdbSerialLib.c b/EmbeddedPkg/Library/GdbSerialLib/GdbSerialLib.c
index 069d87ca78..7931d1ac4e 100644
--- a/EmbeddedPkg/Library/GdbSerialLib/GdbSerialLib.c
+++ b/EmbeddedPkg/Library/GdbSerialLib/GdbSerialLib.c
@@ -40,11 +40,11 @@
 //---------------------------------------------
 // UART Register Bit Defines
 //---------------------------------------------
-#define LSR_TXRDY               0x20
-#define LSR_RXDA                0x01
-#define DLAB                    0x01
-#define ENABLE_FIFO             0x01
-#define CLEAR_FIFOS             0x06
+#define LSR_TXRDY               0x20U
+#define LSR_RXDA                0x01U
+#define DLAB                    0x01U
+#define ENABLE_FIFO             0x01U
+#define CLEAR_FIFOS             0x06U