diff --git a/libc/bionic/libc_init_common.cpp b/libc/bionic/libc_init_common.cpp
index c82c52e..939e4e1 100644
--- a/libc/bionic/libc_init_common.cpp
+++ b/libc/bionic/libc_init_common.cpp
@@ -58,6 +58,7 @@
 
 __LIBC_HIDDEN__ constinit WriteProtected<libc_globals> __libc_globals;
 __LIBC_HIDDEN__ constinit _Atomic(bool) __libc_memtag_stack;
+__LIBC_HIDDEN__ constinit bool __libc_memtag_stack_abi;
 
 // Not public, but well-known in the BSDs.
 __BIONIC_WEAK_VARIABLE_FOR_NATIVE_BRIDGE