diff --git a/tools/trace-malloc/lib/nsTraceMalloc.c b/tools/trace-malloc/lib/nsTraceMalloc.c
index eef1baacc438..78d5ba391b74 100644
--- a/tools/trace-malloc/lib/nsTraceMalloc.c
+++ b/tools/trace-malloc/lib/nsTraceMalloc.c
@@ -97,48 +97,23 @@ extern __ptr_t __libc_valloc(size_t);
 #pragma GCC visibility pop
 #endif
 
-#else  /* !XP_UNIX */
-
-#define __libc_malloc(x) malloc(x)
-#define __libc_calloc(x, y) calloc(x,y)
-#define __libc_realloc(x, y) realloc(x,y)
-#define __libc_free(x) free(x)
-
-/*
- * Ok we need to load malloc, free, realloc, and calloc from the dll and store
- * the function pointers somewhere. All other dlls that link with this library
- * should have their malloc overridden to call this one.
- */
-typedef void * (__stdcall *MALLOCPROC)(size_t);
-typedef void * (__stdcall *REALLOCPROC)(void *, size_t);
-typedef void * (__stdcall *CALLOCPROC)(size_t,size_t);
-typedef void (__stdcall *FREEPROC)(void *);
-
-/*debug types*/
-#ifdef _DEBUG
-typedef void * (__stdcall *MALLOCDEBUGPROC) ( size_t, int, const char *, int);
-typedef void * (__stdcall *CALLOCDEBUGPROC) ( size_t, size_t, int, const char *, int);
-typedef void * (__stdcall *REALLOCDEBUGPROC) ( void *, size_t, int, const char *, int);
-typedef void   (__stdcall *FREEDEBUGPROC) ( void *, int);
-#endif
-
-struct AllocationFuncs
-{
-  MALLOCPROC   malloc_proc;
-  CALLOCPROC   calloc_proc;
-  REALLOCPROC  realloc_proc;
-  FREEPROC     free_proc;
-#ifdef _DEBUG
-  MALLOCDEBUGPROC   malloc_debug_proc;
-  CALLOCDEBUGPROC   calloc_debug_proc;
-  REALLOCDEBUGPROC  realloc_debug_proc;
-  FREEDEBUGPROC     free_debug_proc;
-#endif
-  int          prevent_reentry;
-}gAllocFuncs;
-
 #endif /* !XP_UNIX */
 
+#ifdef XP_WIN32
+
+/* defined in nsWinTraceMalloc.cpp */
+void* dhw_orig_malloc(size_t);
+void* dhw_orig_calloc(size_t, size_t);
+void* dhw_orig_realloc(void*, size_t);
+void dhw_orig_free(void*);
+
+#define __libc_malloc(x)                dhw_orig_malloc(x)
+#define __libc_calloc(x, y)             dhw_orig_calloc(x,y)
+#define __libc_realloc(x, y)            dhw_orig_realloc(x,y)
+#define __libc_free(x)                  dhw_orig_free(x)
+
+#endif
+
 typedef struct logfile logfile;
 
 #define STARTUP_TMBUFSIZE (64 * 1024)
diff --git a/tools/trace-malloc/lib/nsWinTraceMalloc.cpp b/tools/trace-malloc/lib/nsWinTraceMalloc.cpp
index 9e4e334e45a7..3f516e56cd13 100644
--- a/tools/trace-malloc/lib/nsWinTraceMalloc.cpp
+++ b/tools/trace-malloc/lib/nsWinTraceMalloc.cpp
@@ -148,3 +148,34 @@ PR_IMPLEMENT(void)
 ShutdownHooker()
 {
 }
+
+extern "C" {
+  void* dhw_orig_malloc(size_t);
+  void* dhw_orig_calloc(size_t, size_t);
+  void* dhw_orig_realloc(void*, size_t);
+  void dhw_orig_free(void*);
+}
+
+void*
+dhw_orig_malloc(size_t size)
+{
+    return DHW_ORIGINAL(MALLOC_, getMallocHooker())(size);
+}
+
+void*
+dhw_orig_calloc(size_t count, size_t size)
+{
+    return DHW_ORIGINAL(CALLOC_, getCallocHooker())(count,size);
+}
+
+void*
+dhw_orig_realloc(void* pin, size_t size)
+{
+    return DHW_ORIGINAL(REALLOC_, getReallocHooker())(pin, size);
+}
+
+void
+dhw_orig_free(void* p)
+{
+    DHW_ORIGINAL(FREE_, getFreeHooker())(p);
+}