diff --git a/libc/malloc_debug/Config.h b/libc/malloc_debug/Config.h
index cb1de5a..3ee93b2 100644
--- a/libc/malloc_debug/Config.h
+++ b/libc/malloc_debug/Config.h
@@ -49,8 +49,8 @@
 constexpr size_t MINIMUM_ALIGNMENT_BYTES = 8;
 #endif
 
-// If only one or more of these options is set, then no special header is needed.
-constexpr uint64_t NO_HEADER_OPTIONS = FILL_ON_ALLOC | FILL_ON_FREE | EXPAND_ALLOC;
+// If one or more of these options is set, then a special header is needed.
+constexpr uint64_t HEADER_OPTIONS = FRONT_GUARD | REAR_GUARD | BACKTRACE | FREE_TRACK | LEAK_TRACK;
 
 struct Config {
   bool SetFromProperties();