diff --git a/tests/benchmarks/corelib/tools/qlist/main.cpp b/tests/benchmarks/corelib/tools/qlist/main.cpp
index 47e7d8a4a6..b65d02b750 100644
--- a/tests/benchmarks/corelib/tools/qlist/main.cpp
+++ b/tests/benchmarks/corelib/tools/qlist/main.cpp
@@ -103,6 +103,8 @@ struct MyPrimitive : public MyBase
     { ++errorCount; }
     MyPrimitive(const MyPrimitive &other) : MyBase(other)
     { ++errorCount; }
+    MyPrimitive &operator=(const MyPrimitive &other)
+    { ++errorCount; MyBase::operator=(other); return *this; }
     ~MyPrimitive()
     { ++errorCount; }
 };