diff --git a/arch/nios2/include/asm/io.h b/arch/nios2/include/asm/io.h
index c5cf8ea12ef8c0610a5e9c807780bf14d50b8133..9102bfd3fa1c9edb37efd6842fcaa18535742933 100644
--- a/arch/nios2/include/asm/io.h
+++ b/arch/nios2/include/asm/io.h
@@ -11,6 +11,7 @@
 #ifndef _ASM_NIOS2_IO_H
 #define _ASM_NIOS2_IO_H
 
+#include <linux/types.h>
 #include <asm/pgtable-bits.h>
 
 /* PCI is not supported in nios2, set this to 0. */