diff --git a/src/main/java/net/openhft/chronicle/set/ChronicleSetBuilder.java b/src/main/java/net/openhft/chronicle/set/ChronicleSetBuilder.java
index a355222d9..1f14bf3f5 100755
--- a/src/main/java/net/openhft/chronicle/set/ChronicleSetBuilder.java
+++ b/src/main/java/net/openhft/chronicle/set/ChronicleSetBuilder.java
@@ -289,7 +289,8 @@ public final class ChronicleSetBuilder<K>
     @Override
     public ChronicleSetBuilder<K> aligned64BitMemoryOperationsAtomic(
             boolean aligned64BitMemoryOperationsAtomic) {
-        return null;
+        chronicleMapBuilder.aligned64BitMemoryOperationsAtomic(aligned64BitMemoryOperationsAtomic);
+        return this;
     }
 
     @Override