diff --git a/test/src/unit-regression2.cpp b/test/src/unit-regression2.cpp
index 4243cc609..a605c9eeb 100644
--- a/test/src/unit-regression2.cpp
+++ b/test/src/unit-regression2.cpp
@@ -207,7 +207,7 @@ class Foo
 class FooBar
 {
   public:
-    Foo foo;
+    Foo foo{};
 };
 
 inline void from_json(const nlohmann::json& j, FooBar& fb)