diff --git a/sys/amd64/amd64/elf_machdep.c b/sys/amd64/amd64/elf_machdep.c
--- a/sys/amd64/amd64/elf_machdep.c
+++ b/sys/amd64/amd64/elf_machdep.c
@@ -167,17 +167,17 @@
 	}
 }
 
-static boolean_t
+static bool
 freebsd_brand_info_la57_img_compat(struct image_params *imgp,
     int32_t *osrel __unused, uint32_t *fctl0)
 {
 	if ((imgp->proc->p_md.md_flags & P_MD_LA57) != 0)
-		return (TRUE);
+		return (true);
 	if (fctl0 == NULL || (*fctl0 & NT_FREEBSD_FCTL_LA48) != 0)
-		return (FALSE);
+		return (false);
 	if ((imgp->proc->p_md.md_flags & P_MD_LA48) != 0)
-		return (FALSE);
-	return (TRUE);
+		return (false);
+	return (true);
 }
 
 static Elf64_Brandinfo freebsd_brand_info_la48 = {
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
@@ -57,7 +57,7 @@
 #include "opt_global.h"         /* for OPT_KDTRACE_HOOKS */
 #include "opt_stack.h"          /* for OPT_STACK */
 
-static boolean_t elf32_arm_abi_supported(struct image_params *, int32_t *,
+static bool elf32_arm_abi_supported(struct image_params *, int32_t *,
     uint32_t *);
 
 u_long elf_hwcap;
@@ -125,7 +125,7 @@
 	(sysinit_cfunc_t) elf32_insert_brand_entry,
 	&freebsd_brand_info);
 
-static boolean_t
+static bool
 elf32_arm_abi_supported(struct image_params *imgp, int32_t *osrel __unused,
     uint32_t *fctl0 __unused)
 {
@@ -138,9 +138,9 @@
 		if (bootverbose)
 			uprintf("Attempting to execute non EABI binary (rev %d) image %s",
 			    EF_ARM_EABI_VERSION(hdr->e_flags), imgp->args->fname);
-		return (FALSE);
+		return (false);
 	}
-	return (TRUE);
+	return (true);
 }
 
 void
diff --git a/sys/arm64/arm64/elf32_machdep.c b/sys/arm64/arm64/elf32_machdep.c
--- a/sys/arm64/arm64/elf32_machdep.c
+++ b/sys/arm64/arm64/elf32_machdep.c
@@ -74,7 +74,7 @@
     u_long stack);
 static void freebsd32_set_syscall_retval(struct thread *, int);
 
-static boolean_t elf32_arm_abi_supported(struct image_params *, int32_t *,
+static bool elf32_arm_abi_supported(struct image_params *, int32_t *,
     uint32_t *);
 
 extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
@@ -142,7 +142,7 @@
 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
     (sysinit_cfunc_t)elf32_insert_brand_entry, &freebsd32_brand_info);
 
-static boolean_t
+static bool
 elf32_arm_abi_supported(struct image_params *imgp, int32_t *osrel __unused,
     uint32_t *fctl0 __unused)
 {
@@ -151,7 +151,7 @@
 	/* Check if we support AArch32 */
 	if (ID_AA64PFR0_EL0_VAL(READ_SPECIALREG(id_aa64pfr0_el1)) !=
 	    ID_AA64PFR0_EL0_64_32)
-		return (FALSE);
+		return (false);
 
 #define	EF_ARM_EABI_FREEBSD_MIN	EF_ARM_EABI_VER4
 	hdr = (const Elf32_Ehdr *)imgp->image_header;
@@ -161,10 +161,10 @@
 			    "(rev %d) image %s",
 			    EF_ARM_EABI_VERSION(hdr->e_flags),
 			    imgp->args->fname);
-		return (FALSE);
+		return (false);
         }
 
-	return (TRUE);
+	return (true);
 }
 
 static int
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
@@ -149,9 +149,9 @@
 	.sv_regset_end  = SET_LIMIT(__elfN(regset)),
 };
 
-static boolean_t ppc64_elfv1_header_match(struct image_params *params,
+static bool ppc64_elfv1_header_match(struct image_params *params,
     int32_t *, uint32_t *);
-static boolean_t ppc64_elfv2_header_match(struct image_params *params,
+static bool ppc64_elfv2_header_match(struct image_params *params,
     int32_t *, uint32_t *);
 
 static Elf64_Brandinfo freebsd_brand_info_elfv1 = {
@@ -227,7 +227,7 @@
 }
 SYSINIT(elf64_sysvec, SI_SUB_EXEC, SI_ORDER_ANY, ppc64_init_sysvecs, NULL);
 
-static boolean_t
+static bool
 ppc64_elfv1_header_match(struct image_params *params, int32_t *osrel __unused,
     uint32_t *fctl0 __unused)
 {
@@ -237,7 +237,7 @@
 	return (abi == 0 || abi == 1);
 }
 
-static boolean_t
+static bool
 ppc64_elfv2_header_match(struct image_params *params, int32_t *osrel __unused,
     uint32_t *fctl0 __unused)
 {
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
@@ -89,7 +89,7 @@
 	const char *interp_newpath;
 	int flags;
 	Elf_Brandnote *brand_note;
-	boolean_t	(*header_supported)(struct image_params *,
+	bool		(*header_supported)(struct image_params *,
 	    int32_t *, uint32_t *);
 		/* High 8 bits of flags is private to the ABI */
 #define	BI_CAN_EXEC_DYN		0x0001