diff --git a/src/main/webapp/scripts/directives/serverMap.js b/src/main/webapp/scripts/directives/serverMap.js
index 318696f6d..3684df189 100644
--- a/src/main/webapp/scripts/directives/serverMap.js
+++ b/src/main/webapp/scripts/directives/serverMap.js
@@ -350,7 +350,13 @@ pinpointApp.directive('serverMap', [ 'serverMapConfig', 'ServerMapDao', 'Alerts'
                  */
                 scope.toggleMergeUnknowns = function () {
                     scope.mergeUnknowns = (scope.mergeUnknowns) ? false : true;
-                    serverMapCallback(htLastQuery, htLastMapData, scope.mergeUnknowns, scope.linkRouting, scope.linkCurve);
+                    if (scope.mergeUnknowns) {
+                        var copiedData = angular.copy(htLastMapData);
+                        ServerMapDao.mergeUnknown(htLastQuery, copiedData);
+                        serverMapCallback(htLastQuery, copiedData, scope.linkRouting, scope.linkCurve);
+                    } else {
+                        serverMapCallback(htLastQuery, htLastMapData, scope.linkRouting, scope.linkCurve);
+                    }
                     reset();
                 };
 
@@ -361,7 +367,7 @@ pinpointApp.directive('serverMap', [ 'serverMapConfig', 'ServerMapDao', 'Alerts'
                 scope.toggleLinkLableTextType = function (type) {
                     scope.totalRequestCount = (type !== 'tps') ? true : false;
                     scope.tps = (type === 'tps') ? true : false;
-                    serverMapCallback(htLastQuery, htLastMapData, scope.mergeUnknowns, scope.linkRouting, scope.linkCurve);
+                    serverMapCallback(htLastQuery, htLastMapData, scope.linkRouting, scope.linkCurve);
                     reset();
                 };
 
@@ -371,7 +377,7 @@ pinpointApp.directive('serverMap', [ 'serverMapConfig', 'ServerMapDao', 'Alerts'
                  */
                 scope.toggleLinkRouting = function (type) {
                     scope.linkRouting = cfg.options.htLinkType.sRouting = type;
-                    serverMapCallback(htLastQuery, htLastMapData, scope.mergeUnknowns, scope.linkRouting, scope.linkCurve);
+                    serverMapCallback(htLastQuery, htLastMapData, scope.linkRouting, scope.linkCurve);
                     reset();
                 };
 
@@ -381,7 +387,7 @@ pinpointApp.directive('serverMap', [ 'serverMapConfig', 'ServerMapDao', 'Alerts'
                  */
                 scope.toggleLinkCurve = function (type) {
                     scope.linkCurve = cfg.options.htLinkType.sCurve = type;
-                    serverMapCallback(htLastQuery, htLastMapData, scope.mergeUnknowns, scope.linkRouting, scope.linkCurve);
+                    serverMapCallback(htLastQuery, htLastMapData, scope.linkRouting, scope.linkCurve);
                     reset();
                 };