diff --git a/filename_rules.gypi b/filename_rules.gypi
index 500a0d8e1..f20a47255 100644
--- a/filename_rules.gypi
+++ b/filename_rules.gypi
@@ -88,7 +88,7 @@
       'sources/': [ ['exclude', '_aurawin\\.(h|cc)$'] ]
     }],
     ['<(use_ash)==0 or >(nacl_untrusted_build)==1', {
-      'sources/': [ ['exclude', '_ash(_unittest)?\\.(h|cc)$'],
+      'sources/': [ ['exclude', '_ash(_browsertest|_unittest)?\\.(h|cc)$'],
                     ['exclude', '(^|/)ash/'],
       ]
     }],