diff --git a/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java b/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
index c24d23cc9..06b11f4dd 100755
--- a/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
+++ b/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
@@ -155,7 +155,7 @@ class VanillaChronicleMap<K, KI, MKI extends MetaBytesInterop<K, ? super KI>,
 
         lockTimeOutNS = builder.lockTimeOut(TimeUnit.NANOSECONDS);
 
-        boolean replicated = getClass() == ReplicatedChronicleMap.class;
+        boolean replicated = this instanceof ReplicatedChronicleMap;
         this.chunkSize = builder.chunkSize(replicated);
         this.alignment = builder.valueAlignment();
         this.constantlySizedEntry = builder.constantlySizedEntries();