diff --git a/config.w32 b/config.w32
index 9c84a059..7ca3a498 100644
--- a/config.w32
+++ b/config.w32
@@ -36,7 +36,7 @@ if (PHP_MEMCACHED == "yes") {
 	  }
   }
   
-  EXTENSION("memcached", "php_memcached.c php_libmemcached_compat.c g_fmt.c"+memcached_extra_src);
+  EXTENSION("memcached", "php_memcached.c php_libmemcached_compat.c g_fmt.c"+memcached_extra_src, null, " /DHAVE_SSIZE_T");
   ADD_SOURCES(configure_module_dirname+"\\fastlz", "fastlz.c", "memcached");
   AC_DEFINE("HAVE_MEMCACHED", 1, "memcached support");
   AC_DEFINE("MEMCACHED_EXPORTS", 1)