diff --git a/CHANGES b/CHANGES
index 8e02fb298b..0831bb9011 100644
--- a/CHANGES
+++ b/CHANGES
@@ -12,6 +12,9 @@ Changes with Apache 2.3.15
      PR 51714. [Stefan Fritsch, Jim Jagielski, Ruediger Pluem, Eric Covener,
      <lowprio20 gmail.com>]
 
+  *) mod_lua: Resolve "attempt to index local 'r' (a userdata value)" errors
+     in LuaMapHandler scripts [Eric Covener]
+
   *) mod_log_debug: Rename optional argument from if= to expr=, to be more
      in line with other config directives. [Stefan Fritsch]
 
diff --git a/modules/lua/mod_lua.c b/modules/lua/mod_lua.c
index 6bce9a5d0f..816e674aba 100644
--- a/modules/lua/mod_lua.c
+++ b/modules/lua/mod_lua.c
@@ -201,6 +201,9 @@ static int lua_alias_munger(request_rec *r)
                 spec->pool = r->pool;
             }
 
+            spec->cb = &lua_open_callback;
+            spec->cb_arg = NULL;
+
             d = apr_palloc(r->pool, sizeof(mapped_request_details));
 
             d->function_name = ap_pregsub(r->pool, cnd->function_name, r->uri,