diff --git a/sys/cam/scsi/scsi_all.h b/sys/cam/scsi/scsi_all.h
index 64c45fb26a4..f85d285ec93 100644
--- a/sys/cam/scsi/scsi_all.h
+++ b/sys/cam/scsi/scsi_all.h
@@ -3039,7 +3039,7 @@ struct scsi_set_timestamp_parameters
 {
 	uint8_t reserved1[4];
 	uint8_t timestamp[6];
-	uint8_t reserved2[4];
+	uint8_t reserved2[2];
 };
 
 struct scsi_report_timestamp_parameter_data