diff --git a/src/main/java/net/openhft/chronicle/map/ChronicleMapBuilder.java b/src/main/java/net/openhft/chronicle/map/ChronicleMapBuilder.java
index fe198c8b2..0d3e701cc 100755
--- a/src/main/java/net/openhft/chronicle/map/ChronicleMapBuilder.java
+++ b/src/main/java/net/openhft/chronicle/map/ChronicleMapBuilder.java
@@ -146,19 +146,8 @@ public final class ChronicleMapBuilder<K, V> implements Cloneable,
         keyBuilder = new SerializationBuilder<>(keyClass, SerializationBuilder.Role.KEY);
         valueBuilder = new SerializationBuilder<>(valueClass, SerializationBuilder.Role.VALUE);
 
-        if (String.class.equals(valueClass)) {
+        if (CharSequence.class == valueClass)
             defaultValue = (V) "";
-            this.defaultValueProvider = null;
-        } else if (CharSequence.class.isAssignableFrom(valueClass)) {
-            defaultValue = null;
-            this.defaultValueProvider = new DefaultValueProvider<K, V>() {
-
-                @Override
-                public V get(K key) {
-                    return (V) new StringBuilder();
-                }
-            };
-        }
     }
 
     /**