diff --git a/kernel/irq/irq_sim.c b/kernel/irq/irq_sim.c
index 24caabf1a0f7..bd7dc1db6a80 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>