diff --git a/arch/ppc/platforms/4xx/bamboo.h b/arch/ppc/platforms/4xx/bamboo.h
index 63d71450414..5c019282649 100644
--- a/arch/ppc/platforms/4xx/bamboo.h
+++ b/arch/ppc/platforms/4xx/bamboo.h
@@ -88,7 +88,7 @@
 #define STD_UART_OP(num)					\
 	{ 0, BASE_BAUD, 0, UART##num##_INT,			\
 		(ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST),	\
-		iomem_base: UART##num##_IO_BASE,		\
+		iomem_base: (void*)UART##num##_IO_BASE,		\
 		io_type: SERIAL_IO_MEM},
 
 #define SERIAL_PORT_DFNS	\
diff --git a/arch/ppc/platforms/4xx/luan.h b/arch/ppc/platforms/4xx/luan.h
index 09b444c8781..bbe7d0766db 100644
--- a/arch/ppc/platforms/4xx/luan.h
+++ b/arch/ppc/platforms/4xx/luan.h
@@ -55,7 +55,7 @@
 #define STD_UART_OP(num)					\
 	{ 0, BASE_BAUD, 0, UART##num##_INT,			\
 		(ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST),	\
-		iomem_base: UART##num##_IO_BASE,		\
+		iomem_base: (void*)UART##num##_IO_BASE,		\
 		io_type: SERIAL_IO_MEM},
 
 #define SERIAL_PORT_DFNS	\