diff --git a/src/test/java/net/openhft/chronicle/map/Issue43Test.java b/src/test/java/net/openhft/chronicle/map/Issue43Test.java
new file mode 100644
index 000000000..084f4d9ab
--- /dev/null
+++ b/src/test/java/net/openhft/chronicle/map/Issue43Test.java
@@ -0,0 +1,71 @@
+/*
+ *      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 net.openhft.lang.io.Bytes;
+import net.openhft.lang.io.serialization.BytesMarshaller;
+import org.junit.Test;
+
+public class Issue43Test {
+
+    @Test
+    public void testIssue43() {
+        try {
+            ChronicleMap<Long, ValueWrapper> map = ChronicleMapBuilder
+                    .of(Long.class, ValueWrapper.class)
+                    .entries(512)
+                    .valueMarshaller(new ArrayMarshaller())
+                    .constantValueSizeBySample(new ValueWrapper(new double[128]))
+                    .createPersistedTo(Builder.getPersistenceFile());
+            System.out.println("Created the monkey map ValueWrapper 128");
+        } catch (Throwable ex) {
+            System.out.println(ex);
+        }
+    }
+
+
+    private static class ValueWrapper {
+        private final double values[];
+
+        public ValueWrapper(double[] values) {
+            this.values = values;
+        }
+    }
+
+    private static class ArrayMarshaller implements BytesMarshaller<ValueWrapper> {
+
+        @Override
+        public void write(Bytes bytes, ValueWrapper vw) {
+            bytes.writeInt(vw.values.length);
+
+            for (int i = 0; i < vw.values.length; i ++) {
+                bytes.writeDouble(vw.values[i]);
+            }
+        }
+
+        @Override
+        public ValueWrapper read(Bytes bytes) {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+
+        @Override
+        public ValueWrapper read(Bytes arg0, ValueWrapper arg1) {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+
+    }
+}