diff --git a/include/scsi-lowlevel.h b/include/scsi-lowlevel.h
index c18ff1d..a2477a6 100644
--- a/include/scsi-lowlevel.h
+++ b/include/scsi-lowlevel.h
@@ -176,10 +176,6 @@ struct scsi_readtoc_list {
 	struct scsi_readtoc_desc desc[0];
 };
 
-struct scsi_writeverify12_params {
-	uint32_t lba;
-	uint32_t num_blocks;
-};
 struct scsi_writeverify16_params {
 	uint64_t lba;
 	uint32_t num_blocks;
@@ -265,7 +261,6 @@ struct scsi_task {
 	int expxferlen;
 	unsigned char cdb[SCSI_CDB_MAX_SIZE];
 	union {
-		struct scsi_writeverify12_params   writeverify12;
 		struct scsi_writeverify16_params   writeverify16;
 		struct scsi_verify10_params        verify10;
 		struct scsi_verify12_params        verify12;
diff --git a/lib/scsi-lowlevel.c b/lib/scsi-lowlevel.c
index 7c497aa..aff626a 100644
--- a/lib/scsi-lowlevel.c
+++ b/lib/scsi-lowlevel.c
@@ -2172,9 +2172,6 @@ scsi_cdb_writeverify12(uint32_t lba, uint32_t xferlen, int blocksize, int wrprot
 	}
 	task->expxferlen = xferlen;
 
-	task->params.writeverify12.lba        = lba;
-	task->params.writeverify12.num_blocks = xferlen/blocksize;
-
 	return task;
 }