diff --git a/mozci/mozci.py b/mozci/mozci.py
index 409b2a5..e38b50e 100644
--- a/mozci/mozci.py
+++ b/mozci/mozci.py
@@ -378,12 +378,10 @@ def valid_builder(buildername, quiet=False):
         return True
     else:
         if not quiet:
-            LOG.error("Buildername %s is *NOT* valid." % buildername)
-            LOG.info("Check the file we just created builders.txt for "
-                     "a list of valid builders.")
-            with open(path_to_file('builders.txt'), "wb") as fd:
-                for b in sorted(builders):
-                    fd.write(b + "\n")
+            LOG.warning("Buildername %s is *NOT* valid." % buildername)
+            LOG.info("Check {} for valid builders.".format(
+                'http://people.mozilla.org/~armenzg/permanent/all_builders.txt')
+            )
 
         return False