diff --git a/pom.xml b/pom.xml
index 5dd7d9ce4..fd32e0e35 100755
--- a/pom.xml
+++ b/pom.xml
@@ -44,7 +44,7 @@
             <dependency>
                 <groupId>net.openhft</groupId>
                 <artifactId>lang</artifactId>
-                <version>6.4.9</version>
+                <version>6.4.10-SNAPSHOT</version>
             </dependency>
 
             <dependency>
diff --git a/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java b/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
index 8718a0d38..23f166078 100644
--- a/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
+++ b/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
@@ -85,7 +85,6 @@ class VanillaChronicleMap<K, KI, MKI extends MetaBytesInterop<K, KI>,
     // rather than as returning the Object can be expensive for something you probably don't use.
     final boolean putReturnsNull;
     final boolean removeReturnsNull;
-    private final ObjectSerializer objectSerializer;
 
     private final long lockTimeOutNS;
     private final MapErrorListener errorListener;
@@ -130,7 +129,6 @@ class VanillaChronicleMap<K, KI, MKI extends MetaBytesInterop<K, KI>,
         this.errorListener = builder.errorListener();
         this.putReturnsNull = builder.putReturnsNull();
         this.removeReturnsNull = builder.removeReturnsNull();
-        this.objectSerializer = builder.objectSerializer();
 
         this.actualSegments = builder.actualSegments();
         this.entriesPerSegment = builder.actualEntriesPerSegment();
diff --git a/src/test/java/net/openhft/chronicle/map/TestBooleanValues.java b/src/test/java/net/openhft/chronicle/map/TestBooleanValues.java
index 7306e153f..2dc3fb34e 100644
--- a/src/test/java/net/openhft/chronicle/map/TestBooleanValues.java
+++ b/src/test/java/net/openhft/chronicle/map/TestBooleanValues.java
@@ -1,6 +1,6 @@
 package net.openhft.chronicle.map;
 
-import org.junit.Ignore;
+import org.junit.Assert;
 import org.junit.Test;
 
 import java.io.IOException;
@@ -19,7 +19,7 @@ public class TestBooleanValues {
         ChronicleMap<Integer, Boolean> map =
                 ChronicleMapBuilder.of(Integer.class, Boolean.class).create();
         map.put(7, true);
-        Boolean currentValue = map.get(7); // IllegalStateException here
+        Assert.assertEquals(true, map.get(7));
     }
 }