diff --git a/include/shared_irq.h b/include/shared_irq.h
index ab6b841ee53..a85f9502f9e 100644
--- a/include/shared_irq.h
+++ b/include/shared_irq.h
@@ -69,9 +69,8 @@ struct shared_irq_runtime {
 static inline int shared_irq_isr_register(struct device *dev, isr_t isr_func,
 				 struct device *isr_dev)
 {
-	struct shared_irq_driver_api *api;
+	const struct shared_irq_driver_api *api = dev->driver_api;
 
-	api = (struct shared_irq_driver_api *) dev->driver_api;
 	return api->isr_register(dev, isr_func, isr_dev);
 }
 
@@ -82,9 +81,8 @@ static inline int shared_irq_isr_register(struct device *dev, isr_t isr_func,
  */
 static inline int shared_irq_enable(struct device *dev, struct device *isr_dev)
 {
-	struct shared_irq_driver_api *api;
+	const struct shared_irq_driver_api *api = dev->driver_api;
 
-	api = (struct shared_irq_driver_api *) dev->driver_api;
 	return api->enable(dev, isr_dev);
 }
 
@@ -95,9 +93,8 @@ static inline int shared_irq_enable(struct device *dev, struct device *isr_dev)
  */
 static inline int shared_irq_disable(struct device *dev, struct device *isr_dev)
 {
-	struct shared_irq_driver_api *api;
+	const struct shared_irq_driver_api *api = dev->driver_api;
 
-	api = (struct shared_irq_driver_api *) dev->driver_api;
 	return api->disable(dev, isr_dev);
 }