diff --git a/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java b/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
index 6c0147f99..c03366aa4 100755
--- a/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
+++ b/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
@@ -232,10 +232,10 @@ class VanillaChronicleMap<K, KI, MKI extends MetaBytesInterop<K, ? super KI>,
     final long createMappedStoreAndSegments(BytesStore bytesStore) throws IOException {
         // checks the the store has not been closed
         // todo remove the CheckedBytesStore before the release
-        //this.ms = new CheckedBytesStore(bytesStore);
+        this.ms = new CheckedBytesStore(bytesStore);
 
 
-        this.ms = bytesStore;
+       //  this.ms = bytesStore;
 
         onHeaderCreated();
 
@@ -533,13 +533,13 @@ class VanillaChronicleMap<K, KI, MKI extends MetaBytesInterop<K, ? super KI>,
     }
 
     @Override
-    public final V putIfAbsent(  K key, V value) {
-        if (key == null )
+    public final V putIfAbsent(K key, V value) {
+        if (key == null)
             throw new NullPointerException();
         return put1(key, value, false);
     }
 
-    V put1( K key, V value, boolean replaceIfPresent) {
+    V put1(K key, V value, boolean replaceIfPresent) {
         if (key == null)
             throw new NullPointerException();
         checkKey(key);