diff --git a/arch/nds32/include/asm/io.h b/arch/nds32/include/asm/io.h
index 966e71b3c960bf2d199d3612d1160875d41cb2ba..71cd226d6863ee4a218e657dda216535f2e6fcf1 100644
--- a/arch/nds32/include/asm/io.h
+++ b/arch/nds32/include/asm/io.h
@@ -4,6 +4,8 @@
 #ifndef __ASM_NDS32_IO_H
 #define __ASM_NDS32_IO_H
 
+#include <linux/types.h>
+
 extern void iounmap(volatile void __iomem *addr);
 #define __raw_writeb __raw_writeb
 static inline void __raw_writeb(u8 val, volatile void __iomem *addr)