diff --git a/arch/x86/include/asm/serial.h b/arch/x86/include/asm/serial.h
index 628c801535ea9..03ece8e37d31d 100644
--- a/arch/x86/include/asm/serial.h
+++ b/arch/x86/include/asm/serial.h
@@ -21,9 +21,9 @@
 
 #define SERIAL_PORT_DFNS			\
 	/* UART CLK   PORT IRQ     FLAGS        */			\
-	{ 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS },	/* ttyS0 */	\
-	{ 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS },	/* ttyS1 */	\
-	{ 0, BASE_BAUD, 0x3E8, 4, STD_COM_FLAGS },	/* ttyS2 */	\
-	{ 0, BASE_BAUD, 0x2E8, 3, STD_COM4_FLAGS },	/* ttyS3 */
+	{ .uart = 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS }, /* ttyS0 */	\
+	{ .uart = 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS }, /* ttyS1 */	\
+	{ .uart = 0, BASE_BAUD, 0x3E8, 4, STD_COM_FLAGS }, /* ttyS2 */	\
+	{ .uart = 0, BASE_BAUD, 0x2E8, 3, STD_COM4_FLAGS }, /* ttyS3 */
 
 #endif /* _ASM_X86_SERIAL_H */