diff --git a/iscsi-scst/kernel/iscsi.c b/iscsi-scst/kernel/iscsi.c
index bba8976b6..c9456fad2 100644
--- a/iscsi-scst/kernel/iscsi.c
+++ b/iscsi-scst/kernel/iscsi.c
@@ -1017,7 +1017,7 @@ static void iscsi_init_status_rsp(struct iscsi_cmnd *rsp,
 
 		sg_init_table(sg, 2);
 		sg_set_buf(&sg[0], &rsp->sense_hdr, sizeof(rsp->sense_hdr));
-		sg_set_buf(&sg[1], sense_buf, sense_len);
+		sg_set_buf(&sg[1], (u8 *)sense_buf, sense_len);
 
 		rsp->sense_hdr.length = cpu_to_be16(sense_len);
 
@@ -3686,7 +3686,7 @@ static int iscsi_scsi_aen(struct scst_aen *aen)
 
 	sg_init_table(sg, 2);
 	sg_set_buf(&sg[0], &rsp->sense_hdr, sizeof(rsp->sense_hdr));
-	sg_set_buf(&sg[1], sense, sense_len);
+	sg_set_buf(&sg[1], (u8 *)sense, sense_len);
 
 	rsp->sense_hdr.length = cpu_to_be16(sense_len);
 	rsp->pdu.datasize = sizeof(rsp->sense_hdr) + sense_len;
diff --git a/iscsi-scst/kernel/session.c b/iscsi-scst/kernel/session.c
index b03cffdab..953492276 100644
--- a/iscsi-scst/kernel/session.c
+++ b/iscsi-scst/kernel/session.c
@@ -426,7 +426,12 @@ static void iscsi_session_info_show(struct seq_file *seq,
 static int iscsi_session_seq_open(struct inode *inode, struct file *file)
 {
 	int res;
+
+#if defined(RHEL_MAJOR) && RHEL_MAJOR -0 <= 5
+	res = seq_open(file, (struct seq_operations *)&iscsi_seq_op);
+#else
 	res = seq_open(file, &iscsi_seq_op);
+#endif
 	if (!res)
 		((struct seq_file *)file->private_data)->private =
 			iscsi_session_info_show;
diff --git a/scst/src/dev_handlers/scst_vdisk.c b/scst/src/dev_handlers/scst_vdisk.c
index cab5f587f..397976b3e 100644
--- a/scst/src/dev_handlers/scst_vdisk.c
+++ b/scst/src/dev_handlers/scst_vdisk.c
@@ -3013,7 +3013,11 @@ static int vdisk_unmap_file_range(struct scst_cmd *cmd,
 static int vdisk_unmap_range(struct scst_cmd *cmd,
 	struct scst_vdisk_dev *virt_dev, uint64_t start_lba, uint32_t blocks)
 {
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27)
 	int res, err;
+#else
+	int res;
+#endif
 	struct file *fd = virt_dev->fd;
 
 	TRACE_ENTRY();