diff --git a/src/main/java/net/openhft/chronicle/map/ChronicleMapBuilder.java b/src/main/java/net/openhft/chronicle/map/ChronicleMapBuilder.java
index 770aa0421..6b5a3a6af 100644
--- a/src/main/java/net/openhft/chronicle/map/ChronicleMapBuilder.java
+++ b/src/main/java/net/openhft/chronicle/map/ChronicleMapBuilder.java
@@ -21,9 +21,9 @@ import net.openhft.chronicle.common.serialization.AgileBytesMarshaller;
 import net.openhft.chronicle.common.serialization.MetaBytesInterop;
 import net.openhft.chronicle.common.serialization.MetaBytesWriter;
 import net.openhft.chronicle.common.serialization.MetaProvider;
-import net.openhft.chronicle.set.ChronicleSetBuilder;
 import net.openhft.chronicle.common.threadlocal.Provider;
 import net.openhft.chronicle.common.threadlocal.ThreadLocalCopies;
+import net.openhft.chronicle.set.ChronicleSetBuilder;
 import net.openhft.lang.Maths;
 import net.openhft.lang.io.ByteBufferBytes;
 import net.openhft.lang.io.Bytes;
@@ -859,7 +859,7 @@ public class ChronicleMapBuilder<K, V> implements Cloneable,
         keyBuilder.objectSerializer(objectSerializer());
         valueBuilder.objectSerializer(objectSerializer());
 
-        int maxSize = entrySize() * figureBufferAllocationFactor();
+        long maxSize = (long) entrySize() * figureBufferAllocationFactor();
         keyBuilder.maxSize(maxSize);
         valueBuilder.maxSize(maxSize);