diff --git a/persistent-data/data-structures/btree_damage_visitor.h b/persistent-data/data-structures/btree_damage_visitor.h
index c4c1367..9cd2d0a 100644
--- a/persistent-data/data-structures/btree_damage_visitor.h
+++ b/persistent-data/data-structures/btree_damage_visitor.h
@@ -91,16 +91,6 @@ namespace persistent_data {
 			bool damaged_;
 			block_address damage_begin_;
 		};
-
-		inline
-		std::ostream &operator <<(std::ostream &out, damage_tracker::maybe_range64 const &mr) {
-			if (mr)
-				out << "Just " << *mr;
-			else
-				out << "Nothing";
-
-			return out;
-		}
 	}
 
 	//----------------------------------------------------------------
diff --git a/unit-tests/test_utils.h b/unit-tests/test_utils.h
index ee6d95f..fa982a8 100644
--- a/unit-tests/test_utils.h
+++ b/unit-tests/test_utils.h
@@ -109,6 +109,18 @@ namespace test {
 
 		std::auto_ptr<with_directory> dir_;
 	};
+
+	//--------------------------------
+
+	template <typename T>
+	std::ostream &operator <<(std::ostream &out, boost::optional<T> const &maybe) {
+		if (maybe)
+			out << "Just [" << *maybe << "]";
+		else
+			out << "Nothing";
+
+		return out;
+	}
 }
 
 //----------------------------------------------------------------