diff --git a/libc/malloc_debug/malloc_debug.cpp b/libc/malloc_debug/malloc_debug.cpp
index 9f38946..d608f5d 100644
--- a/libc/malloc_debug/malloc_debug.cpp
+++ b/libc/malloc_debug/malloc_debug.cpp
@@ -890,10 +890,9 @@
                   void* arg) {
   ScopedConcurrentLock lock;
   if (g_debug->TrackPointers()) {
-    // Since malloc is disabled, don't bother acquiring any locks.
-    for (auto it = PointerData::begin(); it != PointerData::end(); ++it) {
-      callback(it->first, InternalMallocUsableSize(reinterpret_cast<void*>(it->first)), arg);
-    }
+    PointerData::IteratePointers([&callback, &arg](uintptr_t pointer) {
+      callback(pointer, InternalMallocUsableSize(reinterpret_cast<void*>(pointer)), arg);
+    });
     return 0;
   }