diff --git a/libc/malloc_debug/PointerData.h b/libc/malloc_debug/PointerData.h
index c7958f3..78f0ed8 100644
--- a/libc/malloc_debug/PointerData.h
+++ b/libc/malloc_debug/PointerData.h
@@ -152,7 +152,7 @@
 
   static void GetAllocList(std::vector<ListInfoType>* list);
   static void LogLeaks();
-  static void DumpLiveToFile(FILE* fp);
+  static void DumpLiveToFile(int fd);
 
   static void GetInfo(uint8_t** info, size_t* overall_size, size_t* info_size, size_t* total_memory,
                       size_t* backtrace_size);