diff -ru modsecurity-2.9.0.orig/apache2/msc_lua.c modsecurity-2.9.0/apache2/msc_lua.c
--- modsecurity-2.9.0.orig/apache2/msc_lua.c	2015-02-12 20:08:30.000000000 +0100
+++ modsecurity-2.9.0/apache2/msc_lua.c	2015-02-13 13:07:42.976716385 +0100
@@ -111,8 +111,11 @@
     dump.pool = pool;
     dump.parts = apr_array_make(pool, 128, sizeof(msc_script_part *));
 
+#if LUA_VERSION_NUM >= 503
+    lua_dump(L, dump_writer, &dump, 1);
+#else
     lua_dump(L, dump_writer, &dump);
-
+#endif
     (*script) = apr_pcalloc(pool, sizeof(msc_script));
     (*script)->name = filename;
     (*script)->parts = dump.parts;