diff --git a/tool/lib/test/unit/core_assertions.rb b/tool/lib/test/unit/core_assertions.rb
index 1c4a254dd0..deb9908423 100644
--- a/tool/lib/test/unit/core_assertions.rb
+++ b/tool/lib/test/unit/core_assertions.rb
@@ -275,6 +275,7 @@ eom
         end
         ex
       end
+      alias assert_raise_message assert_raise_with_message
 
       def assert_warning(pat, msg = nil)
         result = nil