diff --git a/zipl/boot/eckd2dump_mv.c b/zipl/boot/eckd2dump_mv.c
index 18b1c9bc..f0bb2c1d 100644
--- a/zipl/boot/eckd2dump_mv.c
+++ b/zipl/boot/eckd2dump_mv.c
@@ -21,7 +21,7 @@
 /*
  * Magic number at start of dump record
  */
-uint64_t __section(.stage2.head) magic = 0x584d554c54363401ULL; /* XMULT64, version 1 */
+const uint64_t __section(.stage2.head) magic = 0x584d554c54363401ULL; /* XMULT64, version 1 */
 
 /*
  * Parameter format for ECKD MV dumper (13 bytes):
diff --git a/zipl/boot/eckd2dump_sv.c b/zipl/boot/eckd2dump_sv.c
index d143bfe8..955010f0 100644
--- a/zipl/boot/eckd2dump_sv.c
+++ b/zipl/boot/eckd2dump_sv.c
@@ -19,7 +19,7 @@
 /*
  * Magic number at start of dump record
  */
-uint64_t __section(.stage2.head) magic = 0x5845434b44363401ULL; /* "XECKD64", version 1 */
+const uint64_t __section(.stage2.head) magic = 0x5845434b44363401ULL; /* "XECKD64", version 1 */
 
 /*
  * Get device characteristics from zipl parameter block
diff --git a/zipl/boot/fba2dump.c b/zipl/boot/fba2dump.c
index e2af3ad8..9a76d2c6 100644
--- a/zipl/boot/fba2dump.c
+++ b/zipl/boot/fba2dump.c
@@ -23,7 +23,7 @@
 /*
  * Magic number at start of dump record
  */
-uint64_t __section(.stage2.head) magic = 0x5844464241363401ULL; /* XDFBA64, version 1 */
+const uint64_t __section(.stage2.head) magic = 0x5844464241363401ULL; /* XDFBA64, version 1 */
 
 /*
  * FBA dump device partition specification
diff --git a/zipl/boot/stage2.c b/zipl/boot/stage2.c
index d5c0752f..9fefee6f 100644
--- a/zipl/boot/stage2.c
+++ b/zipl/boot/stage2.c
@@ -148,4 +148,4 @@ void panic_notify(unsigned long UNUSED(reason))
 {
 }
 
-uint64_t __section(.stage2.head) stage2_head;
+const uint64_t __section(.stage2.head) stage2_head;
diff --git a/zipl/boot/tape2dump.c b/zipl/boot/tape2dump.c
index 638c524b..652d23d3 100644
--- a/zipl/boot/tape2dump.c
+++ b/zipl/boot/tape2dump.c
@@ -37,7 +37,7 @@ struct tape_head {
 	uint64_t	ccw2;
 } __packed;
 
-struct tape_head __section(.stage2.head) tape_head = {
+const struct tape_head __section(.stage2.head) tape_head = {
 	.psw	= PSW_LOAD | STAGE2_ENTRY, /* Start code at 0x2018 */
 	.ccw1	= 0x0700000060000001ULL, /* Rewind ccw */
 	.ccw2	= 0x0200200020003000ULL, /* CCW to load dump tool to 0x2000 */