diff --git a/arch/arm/mach-s3c64xx/include/mach/pm-core.h b/arch/arm/mach-s3c64xx/include/mach/pm-core.h
index c0537f40a3d8..a30a1e3ffc6a 100644
--- a/arch/arm/mach-s3c64xx/include/mach/pm-core.h
+++ b/arch/arm/mach-s3c64xx/include/mach/pm-core.h
@@ -15,6 +15,8 @@
 #ifndef __MACH_S3C64XX_PM_CORE_H
 #define __MACH_S3C64XX_PM_CORE_H __FILE__
 
+#include <linux/serial_s3c.h>
+
 #include <mach/regs-gpio.h>
 
 static inline void s3c_pm_debug_init_uart(void)