diff --git a/libc/bionic/sysconf.cpp b/libc/bionic/sysconf.cpp
index f4845e1..869faef 100644
--- a/libc/bionic/sysconf.cpp
+++ b/libc/bionic/sysconf.cpp
@@ -306,7 +306,7 @@
       return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
 
     case _SC_THREAD_KEYS_MAX:
-      return (BIONIC_TLS_SLOTS - TLS_SLOT_FIRST_USER_SLOT);
+      return (BIONIC_TLS_SLOTS - TLS_SLOT_FIRST_USER_SLOT - GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT);
 
     case _SC_THREAD_STACK_MIN:    return SYSTEM_THREAD_STACK_MIN;
     case _SC_THREAD_THREADS_MAX:  return SYSTEM_THREAD_THREADS_MAX;