diff --git a/libc/bionic/libc_init_common.cpp b/libc/bionic/libc_init_common.cpp
index 51f7ce9..944098f 100644
--- a/libc/bionic/libc_init_common.cpp
+++ b/libc/bionic/libc_init_common.cpp
@@ -57,6 +57,7 @@
 extern "C" void scudo_malloc_set_pattern_fill_contents(int);
 
 __LIBC_HIDDEN__ constinit WriteProtected<libc_globals> __libc_globals;
+__LIBC_HIDDEN__ constinit _Atomic(bool) __libc_memtag_stack;
 
 // Not public, but well-known in the BSDs.
 __BIONIC_WEAK_VARIABLE_FOR_NATIVE_BRIDGE