diff --git a/libc/malloc_debug/PointerData.cpp b/libc/malloc_debug/PointerData.cpp
index 5ab2232..e3a35a6 100644
--- a/libc/malloc_debug/PointerData.cpp
+++ b/libc/malloc_debug/PointerData.cpp
@@ -26,6 +26,7 @@
  * SUCH DAMAGE.
  */
 
+#include <cxxabi.h>
 #include <errno.h>
 #include <inttypes.h>
 #include <signal.h>
@@ -54,8 +55,6 @@
 #include "malloc_debug.h"
 #include "UnwindBacktrace.h"
 
-extern "C" char* __cxa_demangle(const char*, char*, size_t*, int*);
-
 std::atomic_uint8_t PointerData::backtrace_enabled_;
 std::atomic_bool PointerData::backtrace_dump_;
 
@@ -617,8 +616,8 @@
         if (frame.function_name.empty()) {
           dprintf(fd, " \"\" 0}");
         } else {
-          char* demangled_name = __cxa_demangle(frame.function_name.c_str(), nullptr, nullptr,
-                                                nullptr);
+          char* demangled_name =
+              abi::__cxa_demangle(frame.function_name.c_str(), nullptr, nullptr, nullptr);
           const char* name;
           if (demangled_name != nullptr) {
             name = demangled_name;