diff --git a/kernel/up.c b/kernel/up.c
index c04b9dc..1ff27a2 100644
--- a/kernel/up.c
+++ b/kernel/up.c
@@ -2,6 +2,7 @@
  * Uniprocessor-only support functions.  The counterpart to kernel/smp.c
  */
 
+#include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/smp.h>