1diff --git a/src/ntfs_io.c b/src/ntfs_io.c
2index 7f57edd..4b718bb 100644
3--- a/src/ntfs_io.c
4+++ b/src/ntfs_io.c
5@@ -154,8 +154,8 @@ static int ntfs_device_testdisk_io_stat(struct ntfs_device *dev, struct stat *bu
6 return -1;
7 }
8
9-static int ntfs_device_testdisk_io_ioctl(struct ntfs_device *dev, int request,
10- void *argp)
11+static int ntfs_device_testdisk_io_ioctl(struct ntfs_device *dev,
12+ unsigned long request, void *argp)
13 {
14 log_warning( "ntfs_device_testdisk_io_ioctl() unimplemented\n");
15 #ifdef ENOTSUP