diff --git a/test/common/empty.h b/test/common/empty.h
index ece65f85a..48e3c4cd9 100644
--- a/test/common/empty.h
+++ b/test/common/empty.h
@@ -4,6 +4,7 @@
 namespace test {
 
 struct empty {};
+struct other_empty {};
 
 } // namespace test