diff --git a/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java b/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
index 52a8f30c6..79a85936a 100755
--- a/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
+++ b/src/main/java/net/openhft/chronicle/map/VanillaChronicleMap.java
@@ -426,7 +426,7 @@ class VanillaChronicleMap<K, KI, MKI extends MetaBytesInterop<K, ? super KI>,
         return multiMapFactory.sizeInBytes(entriesPerSegment);
     }
 
-    private long sizeOfMultiMapBitSet() {
+    long sizeOfMultiMapBitSet() {
         return MultiMapFactory.sizeOfBitSetInBytes(actualChunksPerSegment);
     }