diff --git a/test/scoped_enum.cpp b/test/scoped_enum.cpp
index 2a83749..3d9afa1 100644
--- a/test/scoped_enum.cpp
+++ b/test/scoped_enum.cpp
@@ -142,6 +142,7 @@ void check_underlying_type()
     // The real check for the type is in the underlying_type trait test.
     namespace_enum2 enum1 = namespace_enum2::value1;
     BOOST_TEST(sizeof(enum1) == sizeof(unsigned char));
+    (void)enum1;
 }
 
 int main(int, char*[])