diff --git a/libc/malloc_debug/UnwindBacktrace.cpp b/libc/malloc_debug/UnwindBacktrace.cpp
index c892a39..8a6ff7b 100644
--- a/libc/malloc_debug/UnwindBacktrace.cpp
+++ b/libc/malloc_debug/UnwindBacktrace.cpp
@@ -26,6 +26,7 @@
  * SUCH DAMAGE.
  */
 
+#include <cxxabi.h>
 #include <inttypes.h>
 #include <pthread.h>
 #include <stdint.h>
@@ -48,8 +49,6 @@
 #define PAD_PTR "08" PRIx64
 #endif
 
-extern "C" char* __cxa_demangle(const char*, char*, size_t*, int*);
-
 bool Unwind(std::vector<uintptr_t>* frames, std::vector<unwindstack::FrameData>* frame_info,
             size_t max_frames) {
   [[clang::no_destroy]] static unwindstack::AndroidLocalUnwinder unwinder(
@@ -89,7 +88,8 @@
 
     if (!info->function_name.empty()) {
       line += " (";
-      char* demangled_name = __cxa_demangle(info->function_name.c_str(), nullptr, nullptr, nullptr);
+      char* demangled_name =
+          abi::__cxa_demangle(info->function_name.c_str(), nullptr, nullptr, nullptr);
       if (demangled_name != nullptr) {
         line += demangled_name;
         free(demangled_name);