diff --git a/platforms/common/include/px4_platform_common/posix.h b/platforms/common/include/px4_platform_common/posix.h
index 8b8c16069f..a2af9057ad 100644
--- a/platforms/common/include/px4_platform_common/posix.h
+++ b/platforms/common/include/px4_platform_common/posix.h
@@ -117,7 +117,7 @@ __EXPORT int 		px4_open(const char *path, int flags, ...);
 __EXPORT int 		px4_close(int fd);
 __EXPORT ssize_t	px4_read(int fd, void *buffer, size_t buflen);
 __EXPORT ssize_t	px4_write(int fd, const void *buffer, size_t buflen);
-__EXPORT int		px4_ioctl(int fd, int cmd, uintptr_t arg);
+__EXPORT int		px4_ioctl(int fd, int cmd, unsigned long arg);
 __EXPORT int		px4_poll(px4_pollfd_struct_t *fds, unsigned int nfds, int timeout);
 __EXPORT int		px4_access(const char *pathname, int mode);
 __EXPORT px4_task_t	px4_getpid(void);
diff --git a/platforms/common/uORB/uORBDeviceNode.cpp b/platforms/common/uORB/uORBDeviceNode.cpp
index 04f589bbbb..fd4ef60e63 100644
--- a/platforms/common/uORB/uORBDeviceNode.cpp
+++ b/platforms/common/uORB/uORBDeviceNode.cpp
@@ -209,7 +209,7 @@ uORB::DeviceNode::write(cdev::file_t *filp, const char *buffer, size_t buflen)
 }
 
 int
-uORB::DeviceNode::ioctl(cdev::file_t *filp, int cmd, uintptr_t arg)
+uORB::DeviceNode::ioctl(cdev::file_t *filp, int cmd, unsigned long arg)
 {
 	switch (cmd) {
 	case ORBIOCUPDATED: {
diff --git a/platforms/common/uORB/uORBDeviceNode.hpp b/platforms/common/uORB/uORBDeviceNode.hpp
index 9e296ab374..527c5ddf2b 100644
--- a/platforms/common/uORB/uORBDeviceNode.hpp
+++ b/platforms/common/uORB/uORBDeviceNode.hpp
@@ -114,7 +114,7 @@ public:
 	/**
 	 * IOCTL control for the subscriber.
 	 */
-	int ioctl(cdev::file_t *filp, int cmd, uintptr_t arg) override;
+	int ioctl(cdev::file_t *filp, int cmd, unsigned long arg) override;
 
 	/**
 	 * Method to publish a data to this node.
diff --git a/src/lib/cdev/CDev.hpp b/src/lib/cdev/CDev.hpp
index 0e8b1a05a2..071ae618fe 100644
--- a/src/lib/cdev/CDev.hpp
+++ b/src/lib/cdev/CDev.hpp
@@ -146,7 +146,7 @@ public:
 	 * @param arg		The ioctl argument value.
 	 * @return		OK on success, or -errno otherwise.
 	 */
-	virtual int	ioctl(file_t *filep, int cmd, uintptr_t arg) { return -ENOTTY; };
+	virtual int	ioctl(file_t *filep, int cmd, unsigned long arg) { return -ENOTTY; };
 
 	/**
 	 * Perform a poll setup/teardown operation.
diff --git a/src/lib/cdev/posix/cdev_platform.cpp b/src/lib/cdev/posix/cdev_platform.cpp
index e18f6dcf17..0a977a1bba 100644
--- a/src/lib/cdev/posix/cdev_platform.cpp
+++ b/src/lib/cdev/posix/cdev_platform.cpp
@@ -312,7 +312,7 @@ extern "C" {
 		return ret;
 	}
 
-	int px4_ioctl(int fd, int cmd, uintptr_t arg)
+	int px4_ioctl(int fd, int cmd, unsigned long arg)
 	{
 		PX4_DEBUG("px4_ioctl fd = %d", fd);
 		int ret = 0;