diff --git a/Source/Scene/EllipsoidTerrainProvider.js b/Source/Scene/EllipsoidTerrainProvider.js
index a8a71f4f3c4f..ea61f9370bef 100644
--- a/Source/Scene/EllipsoidTerrainProvider.js
+++ b/Source/Scene/EllipsoidTerrainProvider.js
@@ -127,7 +127,7 @@ define([
 
         when(verticesPromise, function(result) {
             tile.transientData = {
-                vertices : result,
+                vertices : new Float32Array(result),
                 indices : TerrainProvider.getRegularGridIndices(width, height)
             };
             tile.state = TileState.TRANSFORMED;
diff --git a/Source/Workers/createVerticesFromExtent.js b/Source/Workers/createVerticesFromExtent.js
index 83a905c9020b..6501369bc490 100755
--- a/Source/Workers/createVerticesFromExtent.js
+++ b/Source/Workers/createVerticesFromExtent.js
@@ -17,7 +17,7 @@ define([
 
         ExtentTessellator.computeVertices(parameters);
 
-        return vertices;
+        return vertices.buffer;
     }
 
     return createTaskProcessorWorker(createVerticesFromExtent);