diff --git a/kernel/irq/irq_sim.c b/kernel/irq/irq_sim.c
index 24caabf1a0f78e809d4d8416d1a408b256b52153..bd7dc1db6a804380d53797eaa7c3ed052cc0df66 100644
--- a/kernel/irq/irq_sim.c
+++ b/kernel/irq/irq_sim.c
@@ -7,6 +7,7 @@
  * option) any later version.
  */
 
+#include <linux/slab.h>
 #include <linux/irq_sim.h>
 #include <linux/irq.h>