diff --git a/test/unit/repository_test.rb b/test/unit/repository_test.rb
index c269df7bb..2bf12f1c2 100644
--- a/test/unit/repository_test.rb
+++ b/test/unit/repository_test.rb
@@ -153,8 +153,7 @@ class RepositoryTest < ActiveSupport::TestCase
   def test_destroy_should_delete_parents_associations
     changeset = Changeset.find(102)
     changeset.parents = Changeset.find_all_by_id([100, 101])
-
-    assert_difference 'Changeset.connection.select_all("select * from changeset_parents").size', -2 do
+    assert_difference 'Changeset.connection.select_all("select * from changeset_parents").count', -2 do
       Repository.find(10).destroy
     end
   end
@@ -162,8 +161,7 @@ class RepositoryTest < ActiveSupport::TestCase
   def test_destroy_should_delete_issues_associations
     changeset = Changeset.find(102)
     changeset.issues = Issue.find_all_by_id([1, 2])
-
-    assert_difference 'Changeset.connection.select_all("select * from changesets_issues").size', -2 do
+    assert_difference 'Changeset.connection.select_all("select * from changesets_issues").count', -2 do
       Repository.find(10).destroy
     end
   end