Index: modules/lua/lua_request.c
===================================================================
--- modules/lua/lua_request.c	(revision 1567109)
+++ modules/lua/lua_request.c	(working copy)
@@ -1987,7 +1987,7 @@
         }
     }
     out = apr_psprintf(r->pool, "%s=%s; %s %s", key, value, secure ? "Secure;" : "", expires ? strexpires : "");
-    apr_table_set(r->headers_out, "Set-Cookie", out);
+    apr_table_add(r->headers_out, "Set-Cookie", out);
     return 0;
 }