diff --git a/platform/features/plot/test/PlotControllerSpec.js b/platform/features/plot/test/PlotControllerSpec.js
index e6c79b4e54..e9fec60aaf 100644
--- a/platform/features/plot/test/PlotControllerSpec.js
+++ b/platform/features/plot/test/PlotControllerSpec.js
@@ -49,7 +49,7 @@ define(
             beforeEach(function () {
                 mockScope = jasmine.createSpyObj(
                     "$scope",
-                    [ "$watch", "$on" ]
+                    [ "$watch", "$on", "$emit" ]
                 );
                 mockFormatter = jasmine.createSpyObj(
                     "formatter",