diff --git a/arch/arm/mach-rk2818/include/mach/board.h b/arch/arm/mach-rk2818/include/mach/board.h
index 5bf7f0c8da2e..19fdf560911d 100644
--- a/arch/arm/mach-rk2818/include/mach/board.h
+++ b/arch/arm/mach-rk2818/include/mach/board.h
@@ -19,6 +19,7 @@
 #include <linux/types.h>
 
 /* platform device data structures */
+struct platform_device;
 
 struct RK2818_mddi_platform_data
 {