diff --git a/libc/private/bionic_tls.h b/libc/private/bionic_tls.h
index 80d645a..53fe3d5 100644
--- a/libc/private/bionic_tls.h
+++ b/libc/private/bionic_tls.h
@@ -129,7 +129,8 @@
   passwd_state_t passwd;
 
   char fdtrack_disabled;
-  char padding[3];
+  char bionic_systrace_disabled;
+  char padding[2];
 
   // Initialize the main thread's final object using its bootstrap object.
   void copy_from_bootstrap(const bionic_tls* boot __attribute__((unused))) {