diff --git a/activemodel/test/cases/helper.rb b/activemodel/test/cases/helper.rb
index 7a636747575fb..522a7cebb433f 100644
--- a/activemodel/test/cases/helper.rb
+++ b/activemodel/test/cases/helper.rb
@@ -7,4 +7,7 @@
 # Show backtraces for deprecated behavior for quicker cleanup.
 ActiveSupport::Deprecation.debug = true
 
+# Disable available locale checks to avoid warnings running the test suite.
+I18n.enforce_available_locales = false
+
 require 'active_support/testing/autorun'