diff --git a/bugmon/evaluator_configs/browser.py b/bugmon/evaluator_configs/browser.py
index 24d3d57..6ad09ec 100644
--- a/bugmon/evaluator_configs/browser.py
+++ b/bugmon/evaluator_configs/browser.py
@@ -69,6 +69,9 @@ def iterate(
         for build_flags in BrowserConfiguration.iter_build_flags(bug):
             for env_variables in BrowserConfiguration.iter_env(bug):
                 for filename in BrowserConfiguration.iter_tests(working_dir):
+                    if prefs and prefs == filename:
+                        continue
+
                     for use_harness in [True, False]:
                         evaluator = BrowserEvaluator(
                             filename,