diff --git a/src/main/java/net/openhft/chronicle/map/UnaryOperator.java b/src/main/java/net/openhft/chronicle/map/UnaryOperator.java
deleted file mode 100755
index 4f7942af6..000000000
--- a/src/main/java/net/openhft/chronicle/map/UnaryOperator.java
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- *      Copyright (C) 2015  higherfrequencytrading.com
- *
- *      This program is free software: you can redistribute it and/or modify
- *      it under the terms of the GNU Lesser General Public License as published by
- *      the Free Software Foundation, either version 3 of the License.
- *
- *      This program is distributed in the hope that it will be useful,
- *      but WITHOUT ANY WARRANTY; without even the implied warranty of
- *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *      GNU Lesser General Public License for more details.
- *
- *      You should have received a copy of the GNU Lesser General Public License
- *      along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package net.openhft.chronicle.map;
-
-import java.io.Serializable;
-
-/**
- * Represents a mutator that accepts one mutable argument, which it may alter and produces a result.
- *
- * <p>This is not functional as it can alter an argument.
- *
- * @param <T> the type of the mutable input
-
- */
-
-public interface UnaryOperator<T> extends Serializable {
-    /**
-     * Applies this mutator to the given mutable argument.
-     *
-     * @param t the mutator argument
-     * @return the  result
-     */
-    T update(T t);
-}