diff --git a/dev/run-tests.py b/dev/run-tests.py
index e42e07354c263..94b517d270dfd 100755
--- a/dev/run-tests.py
+++ b/dev/run-tests.py
@@ -113,10 +113,11 @@ def determine_modules_to_test(changed_modules):
     modules_to_test = set()
     for module in changed_modules:
         modules_to_test = modules_to_test.union(determine_modules_to_test(module.dependent_modules))
+    modules_to_test = modules_to_test.union(set(changed_modules))
     # If we need to run all of the tests, then we should short-circuit and return 'root'
     if modules.root in modules_to_test:
         return [modules.root]
-    return modules_to_test.union(set(changed_modules))
+    return modules_to_test
 
 
 def determine_tags_to_exclude(changed_modules):