diff --git a/sys/arm/arm/elf_machdep.c b/sys/arm/arm/elf_machdep.c
--- a/sys/arm/arm/elf_machdep.c
+++ b/sys/arm/arm/elf_machdep.c
@@ -106,7 +106,7 @@
 };
 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
 
-static Elf32_Brandinfo freebsd_brand_info = {
+static const Elf32_Brandinfo freebsd_brand_info = {
 	.brand		= ELFOSABI_FREEBSD,
 	.machine	= EM_ARM,
 	.compat_3_brand	= "FreeBSD",
@@ -118,7 +118,7 @@
 	.header_supported= elf32_arm_abi_supported,
 };
 
-SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
+C_SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
 	(sysinit_cfunc_t) elf32_insert_brand_entry,
 	&freebsd_brand_info);
 
diff --git a/sys/i386/i386/elf_machdep.c b/sys/i386/i386/elf_machdep.c
--- a/sys/i386/i386/elf_machdep.c
+++ b/sys/i386/i386/elf_machdep.c
@@ -92,7 +92,7 @@
 };
 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
 
-static Elf32_Brandinfo freebsd_brand_info = {
+static const Elf32_Brandinfo freebsd_brand_info = {
 	.brand		= ELFOSABI_FREEBSD,
 	.machine	= EM_386,
 	.compat_3_brand	= "FreeBSD",
@@ -103,11 +103,11 @@
 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 };
 
-SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
+C_SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
 	(sysinit_cfunc_t) elf32_insert_brand_entry,
 	&freebsd_brand_info);
 
-static Elf32_Brandinfo freebsd_brand_oinfo = {
+static const Elf32_Brandinfo freebsd_brand_oinfo = {
 	.brand		= ELFOSABI_FREEBSD,
 	.machine	= EM_386,
 	.compat_3_brand	= "FreeBSD",
@@ -118,11 +118,11 @@
 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 };
 
-SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
+C_SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
 	(sysinit_cfunc_t) elf32_insert_brand_entry,
 	&freebsd_brand_oinfo);
 
-static Elf32_Brandinfo kfreebsd_brand_info = {
+static const Elf32_Brandinfo kfreebsd_brand_info = {
 	.brand		= ELFOSABI_FREEBSD,
 	.machine	= EM_386,
 	.compat_3_brand	= "FreeBSD",
@@ -133,7 +133,7 @@
 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
 };
 
-SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
+C_SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
 	(sysinit_cfunc_t) elf32_insert_brand_entry,
 	&kfreebsd_brand_info);
 
diff --git a/sys/i386/linux/linux_sysvec.c b/sys/i386/linux/linux_sysvec.c
--- a/sys/i386/linux/linux_sysvec.c
+++ b/sys/i386/linux/linux_sysvec.c
@@ -796,7 +796,7 @@
 	}
 }
 
-static Elf_Brandnote linux_brandnote = {
+static const Elf_Brandnote linux_brandnote = {
 	.hdr.n_namesz	= sizeof(GNU_ABI_VENDOR),
 	.hdr.n_descsz	= 16,	/* XXX at least 16 */
 	.hdr.n_type	= 1,
@@ -805,7 +805,7 @@
 	.trans_osrel	= linux_trans_osrel
 };
 
-static Elf32_Brandinfo linux_brand = {
+static const Elf32_Brandinfo linux_brand = {
 	.brand		= ELFOSABI_LINUX,
 	.machine	= EM_386,
 	.compat_3_brand	= "Linux",
@@ -816,7 +816,7 @@
 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 };
 
-static Elf32_Brandinfo linux_glibc2brand = {
+static const Elf32_Brandinfo linux_glibc2brand = {
 	.brand		= ELFOSABI_LINUX,
 	.machine	= EM_386,
 	.compat_3_brand	= "Linux",
@@ -827,7 +827,7 @@
 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 };
 
-static Elf32_Brandinfo linux_muslbrand = {
+static const Elf32_Brandinfo linux_muslbrand = {
 	.brand		= ELFOSABI_LINUX,
 	.machine	= EM_386,
 	.compat_3_brand	= "Linux",
@@ -839,7 +839,7 @@
 			    LINUX_BI_FUTEX_REQUEUE
 };
 
-Elf32_Brandinfo *linux_brandlist[] = {
+const Elf32_Brandinfo *linux_brandlist[] = {
 	&linux_brand,
 	&linux_glibc2brand,
 	&linux_muslbrand,
@@ -849,7 +849,7 @@
 static int
 linux_elf_modevent(module_t mod, int type, void *data)
 {
-	Elf32_Brandinfo **brandinfo;
+	const Elf32_Brandinfo **brandinfo;
 	int error;
 	struct linux_ioctl_handler **lihp;
 
diff --git a/sys/kern/imgact_elf.c b/sys/kern/imgact_elf.c
--- a/sys/kern/imgact_elf.c
+++ b/sys/kern/imgact_elf.c
@@ -231,7 +231,7 @@
 
 #define	aligned(a, t)	(rounddown2((u_long)(a), sizeof(t)) == (u_long)(a))
 
-Elf_Brandnote __elfN(freebsd_brandnote) = {
+const Elf_Brandnote __elfN(freebsd_brandnote) = {
 	.hdr.n_namesz	= sizeof(FREEBSD_ABI_VENDOR),
 	.hdr.n_descsz	= sizeof(int32_t),
 	.hdr.n_type	= NT_FREEBSD_ABI_TAG,
@@ -254,7 +254,7 @@
 
 static int GNU_KFREEBSD_ABI_DESC = 3;
 
-Elf_Brandnote __elfN(kfreebsd_brandnote) = {
+const Elf_Brandnote __elfN(kfreebsd_brandnote) = {
 	.hdr.n_namesz	= sizeof(GNU_ABI_VENDOR),
 	.hdr.n_descsz	= 16,	/* XXX at least 16 */
 	.hdr.n_type	= 1,
diff --git a/sys/powerpc/powerpc/elf32_machdep.c b/sys/powerpc/powerpc/elf32_machdep.c
--- a/sys/powerpc/powerpc/elf32_machdep.c
+++ b/sys/powerpc/powerpc/elf32_machdep.c
@@ -143,7 +143,7 @@
 };
 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
 
-static Elf32_Brandinfo freebsd_brand_info = {
+static const Elf32_Brandinfo freebsd_brand_info = {
 	.brand		= ELFOSABI_FREEBSD,
 	.machine	= EM_PPC,
 	.compat_3_brand	= "FreeBSD",
@@ -158,11 +158,11 @@
 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 };
 
-SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
+C_SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
     (sysinit_cfunc_t) elf32_insert_brand_entry,
     &freebsd_brand_info);
 
-static Elf32_Brandinfo freebsd_brand_oinfo = {
+static const Elf32_Brandinfo freebsd_brand_oinfo = {
 	.brand		= ELFOSABI_FREEBSD,
 	.machine	= EM_PPC,
 	.compat_3_brand	= "FreeBSD",
@@ -173,7 +173,7 @@
 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 };
 
-SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
+C_SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
 	(sysinit_cfunc_t) elf32_insert_brand_entry,
 	&freebsd_brand_oinfo);
 
diff --git a/sys/powerpc/powerpc/elf64_machdep.c b/sys/powerpc/powerpc/elf64_machdep.c
--- a/sys/powerpc/powerpc/elf64_machdep.c
+++ b/sys/powerpc/powerpc/elf64_machdep.c
@@ -154,7 +154,7 @@
 static bool ppc64_elfv2_header_match(const struct image_params *params,
     const int32_t *, const uint32_t *);
 
-static Elf64_Brandinfo freebsd_brand_info_elfv1 = {
+static const Elf64_Brandinfo freebsd_brand_info_elfv1 = {
 	.brand		= ELFOSABI_FREEBSD,
 	.machine	= EM_PPC64,
 	.compat_3_brand	= "FreeBSD",
@@ -166,11 +166,11 @@
 	.header_supported = &ppc64_elfv1_header_match
 };
 
-SYSINIT(elf64v1, SI_SUB_EXEC, SI_ORDER_ANY,
+C_SYSINIT(elf64v1, SI_SUB_EXEC, SI_ORDER_ANY,
     (sysinit_cfunc_t) elf64_insert_brand_entry,
     &freebsd_brand_info_elfv1);
 
-static Elf64_Brandinfo freebsd_brand_info_elfv2 = {
+static const Elf64_Brandinfo freebsd_brand_info_elfv2 = {
 	.brand		= ELFOSABI_FREEBSD,
 	.machine	= EM_PPC64,
 	.compat_3_brand	= "FreeBSD",
@@ -182,11 +182,11 @@
 	.header_supported = &ppc64_elfv2_header_match
 };
 
-SYSINIT(elf64v2, SI_SUB_EXEC, SI_ORDER_ANY,
+C_SYSINIT(elf64v2, SI_SUB_EXEC, SI_ORDER_ANY,
     (sysinit_cfunc_t) elf64_insert_brand_entry,
     &freebsd_brand_info_elfv2);
 
-static Elf64_Brandinfo freebsd_brand_oinfo = {
+static const Elf64_Brandinfo freebsd_brand_oinfo = {
 	.brand		= ELFOSABI_FREEBSD,
 	.machine	= EM_PPC64,
 	.compat_3_brand	= "FreeBSD",
@@ -198,7 +198,7 @@
 	.header_supported = &ppc64_elfv1_header_match
 };
 
-SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
+C_SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
 	(sysinit_cfunc_t) elf64_insert_brand_entry,
 	&freebsd_brand_oinfo);
 
diff --git a/sys/riscv/riscv/elf_machdep.c b/sys/riscv/riscv/elf_machdep.c
--- a/sys/riscv/riscv/elf_machdep.c
+++ b/sys/riscv/riscv/elf_machdep.c
@@ -100,7 +100,7 @@
 };
 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
 
-static Elf64_Brandinfo freebsd_brand_info = {
+static const Elf64_Brandinfo freebsd_brand_info = {
 	.brand		= ELFOSABI_FREEBSD,
 	.machine	= EM_RISCV,
 	.compat_3_brand	= "FreeBSD",
@@ -110,7 +110,7 @@
 	.brand_note	= &elf64_freebsd_brandnote,
 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 };
-SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
+C_SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
     (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info);
 
 static void
diff --git a/sys/sys/imgact_elf.h b/sys/sys/imgact_elf.h
--- a/sys/sys/imgact_elf.h
+++ b/sys/sys/imgact_elf.h
@@ -87,7 +87,7 @@
 	const char *interp_newpath;
 	int flags;
 	const Elf_Brandnote *brand_note;
-	bool		(*header_supported)(const struct image_params *,
+	bool		(*const header_supported)(const struct image_params *,
 	    const int32_t *, const uint32_t *);
 		/* High 8 bits of flags is private to the ABI */
 #define	BI_CAN_EXEC_DYN		0x0001
@@ -132,8 +132,8 @@
 void	__elfN(dump_thread)(struct thread *, void *, size_t *);
 
 extern int __elfN(fallback_brand);
-extern Elf_Brandnote __elfN(freebsd_brandnote);
-extern Elf_Brandnote __elfN(kfreebsd_brandnote);
+extern const Elf_Brandnote __elfN(freebsd_brandnote);
+extern const Elf_Brandnote __elfN(kfreebsd_brandnote);
 #endif /* _KERNEL */
 
 #endif /* !_SYS_IMGACT_ELF_H_ */