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diff --git a/src/lib/libzpool/flushwc.c b/src/lib/libzpool/flushwc.c
index 344a61f..d625db2 100644
--- a/src/lib/libzpool/flushwc.c
+++ b/src/lib/libzpool/flushwc.c
@@ -130,12 +130,16 @@ static int flushATAwc(int fd) {
*/
int flushwc(vnode_t *vn) {
int major_number;
+ int minor_number;
if(!S_ISBLK(vn->v_stat.st_mode))
// We can only flush the write cache of a block device.
return ENOTSUP;
major_number = major(vn->v_stat.st_rdev);
+ minor_number = minor(vn->v_stat.st_rdev);
+ if (minor_number % 16 != 0)
+ return ENOTSUP;
switch(major_number) {
case SCSI_DISK0_MAJOR:
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