diff --git a/arch/arm/mach-rk29/board-rk29sdk.c b/arch/arm/mach-rk29/board-rk29sdk.c
index 6390ec601a46..8341b29bb37b 100755
--- a/arch/arm/mach-rk29/board-rk29sdk.c
+++ b/arch/arm/mach-rk29/board-rk29sdk.c
@@ -56,7 +56,7 @@
 #define PMEM_UI_SIZE        SZ_16M
 #define PMEM_VPU_SIZE       SZ_32M
 
-#define PMEM_GPU_BASE       (RK29_SDRAM_PHYS + SDRAM_SIZE - PMEM_GPU_SIZE)
+#define PMEM_GPU_BASE       ((u32)RK29_SDRAM_PHYS + SDRAM_SIZE - PMEM_GPU_SIZE)
 #define PMEM_UI_BASE        (PMEM_GPU_BASE - PMEM_UI_SIZE)
 #define PMEM_VPU_BASE       (PMEM_UI_BASE - PMEM_VPU_SIZE)
 #define LINUX_SIZE          (PMEM_VPU_BASE - RK29_SDRAM_PHYS)