diff --git a/tools/run_on_as_app.py b/tools/run_on_as_app.py
index 5a331ee..a4fbef0 100755
--- a/tools/run_on_as_app.py
+++ b/tools/run_on_as_app.py
@@ -286,7 +286,7 @@
           # Sanity check that keep rules have changed.
           with open(ext_proguard_config_file) as new:
             with open(proguard_config_file) as old:
-              assert(sum(1 for line in new) < sum(1 for line in old))
+              assert(sum(1 for line in new) > sum(1 for line in old))
 
           # Now rebuild generated apk.
           previous_apk = apk_dest