diff --git a/include/i2c.h b/include/i2c.h
index 45f84324068..838d9372d29 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -199,7 +199,8 @@ __syscall int i2c_configure(struct device *dev, u32_t dev_config);
 
 static inline int _impl_i2c_configure(struct device *dev, u32_t dev_config)
 {
-	const struct i2c_driver_api *api = dev->driver_api;
+	const struct i2c_driver_api *api =
+		(const struct i2c_driver_api *)dev->driver_api;
 
 	return api->configure(dev, dev_config);
 }
@@ -230,7 +231,8 @@ static inline int _impl_i2c_transfer(struct device *dev,
 				     struct i2c_msg *msgs, u8_t num_msgs,
 				     u16_t addr)
 {
-	const struct i2c_driver_api *api = dev->driver_api;
+	const struct i2c_driver_api *api =
+		(const struct i2c_driver_api *)dev->driver_api;
 
 	return api->transfer(dev, msgs, num_msgs, addr);
 }
@@ -264,7 +266,8 @@ __syscall int i2c_slave_register(struct device *dev,
 static inline int _impl_i2c_slave_register(struct device *dev,
 					   struct i2c_slave_config *cfg)
 {
-	const struct i2c_driver_api *api = dev->driver_api;
+	const struct i2c_driver_api *api =
+		(const struct i2c_driver_api *)dev->driver_api;
 
 	if (!api->slave_register) {
 		return -ENOTSUP;
@@ -294,7 +297,8 @@ __syscall int i2c_slave_unregister(struct device *dev,
 static inline int _impl_i2c_slave_unregister(struct device *dev,
 					     struct i2c_slave_config *cfg)
 {
-	const struct i2c_driver_api *api = dev->driver_api;
+	const struct i2c_driver_api *api =
+		(const struct i2c_driver_api *)dev->driver_api;
 
 	if (!api->slave_unregister) {
 		return -ENOTSUP;
@@ -319,7 +323,8 @@ __syscall int i2c_slave_driver_register(struct device *dev);
 
 static inline int _impl_i2c_slave_driver_register(struct device *dev)
 {
-	const struct i2c_slave_driver_api *api = dev->driver_api;
+	const struct i2c_slave_driver_api *api =
+		(const struct i2c_slave_driver_api *)dev->driver_api;
 
 	return api->driver_register(dev);
 }
@@ -340,7 +345,8 @@ __syscall int i2c_slave_driver_unregister(struct device *dev);
 
 static inline int _impl_i2c_slave_driver_unregister(struct device *dev)
 {
-	const struct i2c_slave_driver_api *api = dev->driver_api;
+	const struct i2c_slave_driver_api *api =
+		(const struct i2c_slave_driver_api *)dev->driver_api;
 
 	return api->driver_unregister(dev);
 }