diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index c65f282cbc9a..6a1bf9dc7a6a 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1289,7 +1289,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
 		 * thread_mask assigned. See the loop above which or's
 		 * all existing action->thread_mask bits.
 		 */
-		new->thread_mask = 1 << ffz(thread_mask);
+		new->thread_mask = 1UL << ffz(thread_mask);
 
 	} else if (new->handler == irq_default_primary_handler &&
 		   !(desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)) {