diff --git a/engine-api/src/main/java/io/nosqlbench/engine/api/activityimpl/ParameterMap.java b/engine-api/src/main/java/io/nosqlbench/engine/api/activityimpl/ParameterMap.java
index a0ce7161b..da9c14464 100644
--- a/engine-api/src/main/java/io/nosqlbench/engine/api/activityimpl/ParameterMap.java
+++ b/engine-api/src/main/java/io/nosqlbench/engine/api/activityimpl/ParameterMap.java
@@ -46,12 +46,13 @@ public class ParameterMap extends ConcurrentHashMap<String,Object> implements Bi
 
 
 //    private final ConcurrentHashMap<String, String> paramMap = new ConcurrentHashMap<>(10);
-    private final AtomicLong changeCounter = new AtomicLong(0L);
+    private final AtomicLong changeCounter;
     private final LinkedList<Listener> listeners = new LinkedList<>();
 
     public ParameterMap(Map<String, String> valueMap) {
         logger.trace("new parameter map:" + valueMap.toString());
-        super.putAll(valueMap);
+        this.changeCounter=new AtomicLong(0L);
+        putAll(valueMap);
     }
 
     public void assertOnlyOneOf(String... paramName) {