diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index b12bdd8e2b..2214958d6b 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -36,6 +36,8 @@
 
 #define IO_SPACE_LIMIT 0xffff
 
+#include <asm/types.h>
+
 
 #ifdef __KERNEL__