diff --git a/js/common/model/Graph.js b/js/common/model/Graph.js
index 2f5ebb99..f0d88afd 100644
--- a/js/common/model/Graph.js
+++ b/js/common/model/Graph.js
@@ -6,7 +6,7 @@
  * @author Chris Malley (PixelZoom, Inc.)
  */
 
-import ObservableArray from '../../../../axon/js/ObservableArray.js';
+import createObservableArray from '../../../../axon/js/createObservableArray.js';
 import Vector2 from '../../../../dot/js/Vector2.js';
 import graphingLines from '../../graphingLines.js';
 
@@ -21,7 +21,7 @@ class Graph {
     // @public
     this.xRange = xRange;
     this.yRange = yRange;
-    this.lines = new ObservableArray(); // {Line} lines that the graph is currently displaying
+    this.lines = createObservableArray(); // {Line} lines that the graph is currently displaying
   }
 
   // @public
diff --git a/js/common/model/LineFormsModel.js b/js/common/model/LineFormsModel.js
index c251972c..76cb60b0 100644
--- a/js/common/model/LineFormsModel.js
+++ b/js/common/model/LineFormsModel.js
@@ -6,7 +6,7 @@
  * @author Chris Malley (PixelZoom, Inc.)
  */
 
-import ObservableArray from '../../../../axon/js/ObservableArray.js';
+import createObservableArray from '../../../../axon/js/createObservableArray.js';
 import Property from '../../../../axon/js/Property.js';
 import Bounds2 from '../../../../dot/js/Bounds2.js';
 import Vector2 from '../../../../dot/js/Vector2.js';
@@ -41,8 +41,8 @@ class LineFormsModel {
     this.modelViewTransform = ModelViewTransform2.createOffsetXYScaleMapping( ORIGIN_OFFSET, modelViewTransformScale, -modelViewTransformScale ); // y is inverted
 
     // @public static lines
-    this.savedLines = new ObservableArray();
-    this.standardLines = new ObservableArray();
+    this.savedLines = createObservableArray();
+    this.standardLines = createObservableArray();
 
     // Update the lines seen by the graph.
     // unmultilink is unnecessary because we own these Properties, and the model exists for the lifetime of the sim.