diff --git a/libc/private/bionic_asm_arm64.h b/libc/private/bionic_asm_arm64.h
index 5d83d9b..ffc7181 100644
--- a/libc/private/bionic_asm_arm64.h
+++ b/libc/private/bionic_asm_arm64.h
@@ -76,3 +76,4 @@
 #define NT_MEMTAG_LEVEL_ASYNC 1
 #define NT_MEMTAG_LEVEL_SYNC 2
 #define NT_MEMTAG_HEAP 4
+#define NT_MEMTAG_STACK 8