diff --git a/src/ngx_rewrite_driver_factory.cc b/src/ngx_rewrite_driver_factory.cc
index a6acc8b605..8b68456b88 100644
--- a/src/ngx_rewrite_driver_factory.cc
+++ b/src/ngx_rewrite_driver_factory.cc
@@ -147,10 +147,19 @@ NamedLockManager* NgxRewriteDriverFactory::DefaultLockManager() {
 
 RewriteOptions* NgxRewriteDriverFactory::NewRewriteOptions() {
   NgxRewriteOptions* options = new NgxRewriteOptions(thread_system());
+  // TODO(jefftk): figure out why using SetDefaultRewriteLevel like
+  // mod_pagespeed does in mod_instaweb.cc:create_dir_config() isn't enough here
+  // -- if you use that instead then ngx_pagespeed doesn't actually end up
+  // defaulting CoreFilters.
+  // See: https://github.com/pagespeed/ngx_pagespeed/issues/1190
   options->SetRewriteLevel(RewriteOptions::kCoreFilters);
   return options;
 }
 
+RewriteOptions* NgxRewriteDriverFactory::NewRewriteOptionsForQuery() {
+  return new NgxRewriteOptions(thread_system());
+}
+
 bool NgxRewriteDriverFactory::CheckResolver() {
   if (use_native_fetcher_ && resolver_ == NULL) {
     return false;
diff --git a/src/ngx_rewrite_driver_factory.h b/src/ngx_rewrite_driver_factory.h
index 70f66852e6..2450ddcdf8 100644
--- a/src/ngx_rewrite_driver_factory.h
+++ b/src/ngx_rewrite_driver_factory.h
@@ -63,8 +63,9 @@ class NgxRewriteDriverFactory : public SystemRewriteDriverFactory {
   virtual Timer* DefaultTimer();
   virtual NamedLockManager* DefaultLockManager();
   // Create a new RewriteOptions.  In this implementation it will be an
-  // NgxRewriteOptions.
+  // NgxRewriteOptions, and it will have CoreFilters explicitly set.
   virtual RewriteOptions* NewRewriteOptions();
+  virtual RewriteOptions* NewRewriteOptionsForQuery();
   virtual ServerContext* NewDecodingServerContext();
   // Check resolver configured or not.
   bool CheckResolver();
diff --git a/test/pagespeed_test.conf.template b/test/pagespeed_test.conf.template
index f6e48d297e..ab364ea27c 100644
--- a/test/pagespeed_test.conf.template
+++ b/test/pagespeed_test.conf.template
@@ -1559,6 +1559,15 @@ http {
     pagespeed FileCachePath "@@FILE_CACHE@@";
   }
 
+  server {
+    pagespeed on;
+    listen @@SECONDARY_PORT@@;
+    listen [::]:@@SECONDARY_PORT@@;
+    server_name debug-filters.example.com;
+    pagespeed FileCachePath "@@FILE_CACHE@@";
+    pagespeed RewriteLevel PassThrough;
+    pagespeed EnableFilters debug;
+  }
   server {
     listen @@PRIMARY_PORT@@;
     listen [::]:@@PRIMARY_PORT@@;