diff --git a/sys/arm64/arm64/elf_machdep.c b/sys/arm64/arm64/elf_machdep.c
--- a/sys/arm64/arm64/elf_machdep.c
+++ b/sys/arm64/arm64/elf_machdep.c
@@ -93,6 +93,7 @@
 	.sv_schedtail	= NULL,
 	.sv_thread_detach = NULL,
 	.sv_trap	= NULL,
+	.sv_stackgap	= elf64_stackgap,
 	.sv_hwcap	= &elf_hwcap,
 	.sv_hwcap2	= &elf_hwcap2,
 	.sv_onexec_old	= exec_onexec_old,