diff --git a/tools/testing/target_determination/heuristics/correlated_with_historical_failures.py b/tools/testing/target_determination/heuristics/correlated_with_historical_failures.py
index c5a7bbf..32534e1 100644
--- a/tools/testing/target_determination/heuristics/correlated_with_historical_failures.py
+++ b/tools/testing/target_determination/heuristics/correlated_with_historical_failures.py
@@ -47,5 +47,5 @@
     for file in changed_files:
         for test_file, score in test_file_ratings.get(file, {}).items():
             ratings[test_file] += score
-    prioritize = sorted(ratings, key=lambda x: ratings[x])
+    prioritize = sorted(ratings, key=lambda x: -ratings[x])
     return prioritize