Index: src/runtime/lookup-asm/lookup-asm-arm64-elf.S
==================================================================
--- src/runtime/lookup-asm/lookup-asm-arm64-elf.S
+++ src/runtime/lookup-asm/lookup-asm-arm64-elf.S
@@ -49,10 +49,14 @@
 
 	mov	x0, x2
 	ret
 
 .Ltagged_pointer_\name:
+	adrp	x2, :got:objc_tagged_pointer_secret
+	ldr	x2, [x2, #:got_lo12:objc_tagged_pointer_secret]
+	ldr	x2, [x2]
+	eor	x0, x0, x2
 	and	x0, x0, #0xE
 	lsl	x0, x0, #2
 
 	adrp	x2, :got:objc_tagged_pointer_classes
 	ldr	x2, [x2, #:got_lo12:objc_tagged_pointer_classes]