diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index a90b053..07d44e1 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -425,8 +425,8 @@
 {
     size_t *needed = needed_param;
 
+    *needed += sizeof(struct dm_target_versions);
     *needed += strlen(tt->name);
-    *needed += sizeof(tt->version);
     *needed += ALIGN_MASK;
 }