diff --git a/include/spdk/scsi_spec.h b/include/spdk/scsi_spec.h
index 2bca212a2..2711c8ea4 100644
--- a/include/spdk/scsi_spec.h
+++ b/include/spdk/scsi_spec.h
@@ -548,7 +548,7 @@ enum spdk_scsi_pr_type_code {
 struct spdk_scsi_pr_in_read_header {
 	/* persistent reservation generation */
 	uint32_t pr_generation;
-	uint32_t addiontal_len;
+	uint32_t additional_len;
 };
 SPDK_STATIC_ASSERT(sizeof(struct spdk_scsi_pr_in_read_header) == 8, "Incorrect size");
 
diff --git a/lib/scsi/scsi_pr.c b/lib/scsi/scsi_pr.c
index 09410ad11..e89dcca90 100644
--- a/lib/scsi/scsi_pr.c
+++ b/lib/scsi/scsi_pr.c
@@ -581,7 +581,7 @@ spdk_scsi_pr_in_read_keys(struct spdk_scsi_task *task, uint8_t *data,
 		to_be64(&keys->rkeys[count], reg->rkey);
 		count++;
 	}
-	to_be32(&keys->header.addiontal_len, count * 8);
+	to_be32(&keys->header.additional_len, count * 8);
 
 	return (sizeof(keys->header) + count * 8);
 }
@@ -605,7 +605,7 @@ spdk_scsi_pr_in_read_reservations(struct spdk_scsi_task *task,
 		} else {
 			to_be64(&param->rkey, lun->reservation.crkey);
 		}
-		to_be32(&param->header.addiontal_len, 16);
+		to_be32(&param->header.additional_len, 16);
 		param->scope = SPDK_SCSI_PR_LU_SCOPE;
 		param->type = lun->reservation.rtype;
 		SPDK_DEBUGLOG(SPDK_LOG_SCSI, "READ RESERVATIONS with valid reservation\n");
@@ -613,7 +613,7 @@ spdk_scsi_pr_in_read_reservations(struct spdk_scsi_task *task,
 	}
 
 	/* no reservation */
-	to_be32(&param->header.addiontal_len, 0);
+	to_be32(&param->header.additional_len, 0);
 	SPDK_DEBUGLOG(SPDK_LOG_SCSI, "READ RESERVATIONS no reservation\n");
 	return sizeof(param->header);
 }