diff --git a/drivers/serial/mrst_max3110.c b/drivers/serial/mrst_max3110.c
index f6ad1ecbff79..51c15f58e01e 100644
--- a/drivers/serial/mrst_max3110.c
+++ b/drivers/serial/mrst_max3110.c
@@ -29,6 +29,7 @@
 
 #include <linux/module.h>
 #include <linux/ioport.h>
+#include <linux/irq.h>
 #include <linux/init.h>
 #include <linux/console.h>
 #include <linux/sysrq.h>