diff --git a/tests/src/unit-custom-integer.cpp b/tests/src/unit-custom-integer.cpp
index e5958eaef..eab965548 100644
--- a/tests/src/unit-custom-integer.cpp
+++ b/tests/src/unit-custom-integer.cpp
@@ -47,7 +47,7 @@ class wrapped_int
 
     // allow implicit conversions from anything that `T` allows conversions from
     template<typename T2, typename = typename std::enable_if<std::is_convertible<T2, T>::value>::type>
-    wrapped_int(T2 val) : val(val) {}
+    wrapped_int(T2 val) : m_val(val) {}
 
     bool operator==(const wrapped_int& other) const
     {