--- a/testing/mozharness/mozharness/mozilla/building/buildbase.py
+++ b/testing/mozharness/mozharness/mozilla/building/buildbase.py
@@ -1995,17 +1995,18 @@ or run without that action (ie: --no-{ac
                 "alertChangeType": "absolute",
                 "alertThreshold": (200 * 1024),
                 "subtests": size_measurements
             })
         else:
             yield filter_alert({
                 "name": "installer size",
                 "value": installer_size,
-                "alertThreshold": 1.0,
+                "alertChangeType": "absolute",
+                "alertThreshold": (100 * 1024),
                 "subtests": size_measurements
             })
 
     def _generate_build_stats(self):
         """grab build stats following a compile.
 
         This action handles all statistics from a build: 'count_ctors'
         and then posts to graph server the results.