diff --git a/include/scsi-lowlevel.h b/include/scsi-lowlevel.h
index 5545921..06695b9 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_write12_params {
-	uint32_t lba;
-	uint32_t num_blocks;
-};
 struct scsi_write16_params {
 	uint64_t lba;
 	uint32_t num_blocks;
@@ -296,7 +292,6 @@ struct scsi_task {
 	int expxferlen;
 	unsigned char cdb[SCSI_CDB_MAX_SIZE];
 	union {
-		struct scsi_write12_params         write12;
 		struct scsi_write16_params         write16;
 		struct scsi_startstopunit_params   startstopunit;
 		struct scsi_preventallow_params    preventallow;
diff --git a/lib/scsi-lowlevel.c b/lib/scsi-lowlevel.c
index 15be3ae..005beca 100644
--- a/lib/scsi-lowlevel.c
+++ b/lib/scsi-lowlevel.c
@@ -1240,9 +1240,6 @@ scsi_cdb_write12(uint32_t lba, uint32_t xferlen, int blocksize, int wrprotect, i
 	}
 	task->expxferlen = xferlen;
 
-	task->params.write12.lba        = lba;
-	task->params.write12.num_blocks = xferlen/blocksize;
-
 	return task;
 }