diff --git a/libc/arch-arm64/bionic/vfork.S b/libc/arch-arm64/bionic/vfork.S
index df7b063..9878e8d 100644
--- a/libc/arch-arm64/bionic/vfork.S
+++ b/libc/arch-arm64/bionic/vfork.S
@@ -45,6 +45,9 @@
     ldr     w10, [x9, #20]
     str     w0, [x9, #20]
 
+    // Clear vfork_child_stack_bottom_.
+    str     xzr, [x9, #776]
+
     mov     x0, #(CLONE_VM | CLONE_VFORK | SIGCHLD)
     mov     x1, xzr
     mov     x2, xzr
@@ -62,9 +65,6 @@
     cneg    x0, x0, hi
     b.hi    __set_errno_internal
 
-#if __has_feature(hwaddress_sanitizer)
-    cbz x0, .L_exit
-
     // Clean up stack shadow in the parent process.
     // https://github.com/google/sanitizers/issues/925
     paciasp
@@ -75,7 +75,7 @@
     .cfi_rel_offset x30, 8
 
     add x0, sp, #16
-    bl __hwasan_handle_vfork
+    bl memtag_handle_vfork
 
     ldp x0, x30, [sp], #16
     .cfi_adjust_cfa_offset -16
@@ -84,8 +84,6 @@
     autiasp
     .cfi_negate_ra_state
 
-#endif
-
 .L_exit:
     ret
 END(vfork)