diff --git a/src/cpu/allwinner/a10/uart_console.c b/src/cpu/allwinner/a10/uart_console.c
index b787961d39..ff8634856e 100644
--- a/src/cpu/allwinner/a10/uart_console.c
+++ b/src/cpu/allwinner/a10/uart_console.c
@@ -12,7 +12,7 @@
 
 #include "memmap.h"
 
-unsigned int uart_platform_base(int idx)
+uintptr_t uart_platform_base(int idx)
 {
 	/* UART blocks are mapped 0x400 bytes apart */
 	if (idx < 8)
diff --git a/src/cpu/ti/am335x/uart.c b/src/cpu/ti/am335x/uart.c
index d398d9aba6..57568341c2 100644
--- a/src/cpu/ti/am335x/uart.c
+++ b/src/cpu/ti/am335x/uart.c
@@ -153,7 +153,7 @@ unsigned int uart_platform_refclk(void)
 	return 48000000;
 }
 
-unsigned int uart_platform_base(int idx)
+uintptr_t uart_platform_base(int idx)
 {
 	const unsigned int bases[] = {
 		0x44e09000, 0x48022000, 0x48024000,
diff --git a/src/drivers/uart/oxpcie_early.c b/src/drivers/uart/oxpcie_early.c
index fd378068b3..343056cdb6 100644
--- a/src/drivers/uart/oxpcie_early.c
+++ b/src/drivers/uart/oxpcie_early.c
@@ -77,7 +77,7 @@ static int oxpcie_uart_active(void)
 	return (car_get_var(oxpcie_present));
 }
 
-unsigned int uart_platform_base(int idx)
+uintptr_t uart_platform_base(int idx)
 {
 	if (idx == 0 && oxpcie_uart_active())
 		return uart0_base;
diff --git a/src/drivers/uart/uart8250io.c b/src/drivers/uart/uart8250io.c
index f4f4d010a5..60a8d86361 100644
--- a/src/drivers/uart/uart8250io.c
+++ b/src/drivers/uart/uart8250io.c
@@ -105,7 +105,7 @@ static void uart8250_init(unsigned base_port, unsigned divisor)
 
 static const unsigned bases[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
 
-unsigned int uart_platform_base(int idx)
+uintptr_t uart_platform_base(int idx)
 {
 	if (idx < ARRAY_SIZE(bases))
 		return bases[idx];
diff --git a/src/include/console/uart.h b/src/include/console/uart.h
index d4020c3aa0..94933fe3fe 100644
--- a/src/include/console/uart.h
+++ b/src/include/console/uart.h
@@ -45,7 +45,7 @@ void uart_tx_byte(int idx, unsigned char data);
 void uart_tx_flush(int idx);
 unsigned char uart_rx_byte(int idx);
 
-unsigned int uart_platform_base(int idx);
+uintptr_t uart_platform_base(int idx);
 
 #if !defined(__ROMCC__)
 static inline void *uart_platform_baseptr(int idx)
diff --git a/src/soc/nvidia/tegra124/uart.c b/src/soc/nvidia/tegra124/uart.c
index 71a951fd88..fd8074daa0 100644
--- a/src/soc/nvidia/tegra124/uart.c
+++ b/src/soc/nvidia/tegra124/uart.c
@@ -95,7 +95,7 @@ static int tegra124_uart_tst_byte(struct tegra124_uart *uart_ptr)
 	return (read8(&uart_ptr->lsr) & UART8250_LSR_DR) == UART8250_LSR_DR;
 }
 
-unsigned int uart_platform_base(int idx)
+uintptr_t uart_platform_base(int idx)
 {
 	//Default to UART A
 	unsigned int base = 0x70006000;
diff --git a/src/soc/samsung/exynos5250/uart.c b/src/soc/samsung/exynos5250/uart.c
index cc97291807..c02cdf74c0 100644
--- a/src/soc/samsung/exynos5250/uart.c
+++ b/src/soc/samsung/exynos5250/uart.c
@@ -157,7 +157,7 @@ static void exynos5_uart_tx_flush(struct s5p_uart *uart)
 	while (readl(&uart->ufstat) & 0x1ff0000);
 }
 
-unsigned int uart_platform_base(int idx)
+uintptr_t uart_platform_base(int idx)
 {
 	if (idx < 4)
 		return 0x12c00000 + idx * 0x10000;
diff --git a/src/soc/samsung/exynos5420/uart.c b/src/soc/samsung/exynos5420/uart.c
index be96d5b86c..b7ef0cb1bc 100644
--- a/src/soc/samsung/exynos5420/uart.c
+++ b/src/soc/samsung/exynos5420/uart.c
@@ -149,7 +149,7 @@ static void exynos5_uart_tx_byte(struct s5p_uart *uart, unsigned char data)
 	writeb(data, &uart->utxh);
 }
 
-unsigned int uart_platform_base(int idx)
+uintptr_t uart_platform_base(int idx)
 {
 	if (idx < 4)
 		return 0x12c00000 + idx * 0x10000;