diff --git a/headers/private/kernel/arch/arm/uart_pl011.h b/headers/private/kernel/arch/arm/uart_pl011.h
index 470f40b507..79d9c8c29b 100644
--- a/headers/private/kernel/arch/arm/uart_pl011.h
+++ b/headers/private/kernel/arch/arm/uart_pl011.h
@@ -162,8 +162,8 @@ public:
 	void					FlushRx();
 
 private:
-	void					WriteUart(uint32 reg, unsigned char data);
-	unsigned char			ReadUart(uint32 reg);
+	void					WriteUart(uint32 reg, uint32 data);
+	uint32					ReadUart(uint32 reg);
 
 	bool					fUARTEnabled;
 	addr_t					fUARTBase;
diff --git a/src/system/kernel/arch/arm/uart_pl011.cpp b/src/system/kernel/arch/arm/uart_pl011.cpp
index 3bcab84153..7eb6132114 100644
--- a/src/system/kernel/arch/arm/uart_pl011.cpp
+++ b/src/system/kernel/arch/arm/uart_pl011.cpp
@@ -63,16 +63,16 @@ UartPL011::~UartPL011()
 
 
 void
-UartPL011::WriteUart(uint32 reg, unsigned char data)
+UartPL011::WriteUart(uint32 reg, uint32 data)
 {
-	*(volatile unsigned char *)(fUARTBase + reg) = data;
+	*(volatile uint32*)(fUARTBase + reg) = data;
 }
 
 
-unsigned char
+uint32
 UartPL011::ReadUart(uint32 reg)
 {
-	return *(volatile unsigned char *)(fUARTBase + reg);
+	return *(volatile uint32*)(fUARTBase + reg);
 }