diff --git a/src/main/java/com/nhn/pinpoint/profiler/monitor/metric/DefaultResponseMetric.java b/src/main/java/com/nhn/pinpoint/profiler/monitor/metric/DefaultResponseMetric.java
index f1468d001..0e74eb70e 100644
--- a/src/main/java/com/nhn/pinpoint/profiler/monitor/metric/DefaultResponseMetric.java
+++ b/src/main/java/com/nhn/pinpoint/profiler/monitor/metric/DefaultResponseMetric.java
@@ -15,7 +15,7 @@ public class DefaultResponseMetric implements ResponseMetric {
 
     private final ServiceType serviceType;
     // TODO lru cache로 변경할것. lru로 변경할 경우 counting이 틀려질 가능성이 있으나, oom이 발생하는것을 막을수 있음.
-    private final ConcurrentMap<String, Histogram> histogramMap = new ConcurrentHashMap<String, Histogram>(256, 0.75f, 128);
+    private final ConcurrentMap<String, Histogram> histogramMap = new ConcurrentHashMap<String, Histogram>();
 
     public DefaultResponseMetric(ServiceType serviceType) {
         if (serviceType == null) {
diff --git a/src/main/java/com/nhn/pinpoint/profiler/monitor/metric/MetricRegistry.java b/src/main/java/com/nhn/pinpoint/profiler/monitor/metric/MetricRegistry.java
index 1f3495e59..a19c2e1a0 100644
--- a/src/main/java/com/nhn/pinpoint/profiler/monitor/metric/MetricRegistry.java
+++ b/src/main/java/com/nhn/pinpoint/profiler/monitor/metric/MetricRegistry.java
@@ -13,7 +13,7 @@ import java.util.concurrent.ConcurrentMap;
  */
 public class MetricRegistry {
 
-    private final ConcurrentMap<Short, ResponseMetric> rpcCache = new ConcurrentHashMap<Short, ResponseMetric>(256, 0.75f, 128);
+    private final ConcurrentMap<Short, ResponseMetric> rpcCache = new ConcurrentHashMap<Short, ResponseMetric>();
 
     private final Histogram responseMetric;