diff --git a/arch/x86/include/asm/i8259.h b/arch/x86/include/asm/i8259.h
index bb078786a323..be6492c0deae 100644
--- a/arch/x86/include/asm/i8259.h
+++ b/arch/x86/include/asm/i8259.h
@@ -2,6 +2,7 @@
 #define _ASM_X86_I8259_H
 
 #include <linux/delay.h>
+#include <asm/io.h>
 
 extern unsigned int cached_irq_mask;