diff --git a/src/extras/index.js b/src/extras/index.js
index 7fe38b3..b1b793c 100644
--- a/src/extras/index.js
+++ b/src/extras/index.js
@@ -7,6 +7,7 @@
 export { default as TilingSpriteRenderer } from './webgl/TilingSpriteRenderer';
 export { default as BitmapText } from './BitmapText';
 
-export { default as cacheAsBitmap } from './cacheAsBitmap';
-export { default as getChildByName } from './getChildByName';
-export { default as getGlobalPosition } from './getGlobalPosition';
+// imported for side effect of extending the prototype only, contains no exports
+import './cacheAsBitmap';
+import './getChildByName';
+import './getGlobalPosition';

diff --git a/src/extras/index.js b/src/extras/index.js
index 7fe38b3..b1b793c 100644
--- a/src/extras/index.js
+++ b/src/extras/index.js
@@ -7,6 +7,7 @@
 export { default as TilingSpriteRenderer } from './webgl/TilingSpriteRenderer';
 export { default as BitmapText } from './BitmapText';
 
-export { default as cacheAsBitmap } from './cacheAsBitmap';
-export { default as getChildByName } from './getChildByName';
-export { default as getGlobalPosition } from './getGlobalPosition';
+// imported for side effect of extending the prototype only, contains no exports
+import './cacheAsBitmap';
+import './getChildByName';
+import './getGlobalPosition';
diff --git a/src/extras/webgl/TilingSpriteRenderer.js b/src/extras/webgl/TilingSpriteRenderer.js
index 2f14e89..bdf815c 100644
--- a/src/extras/webgl/TilingSpriteRenderer.js
+++ b/src/extras/webgl/TilingSpriteRenderer.js
@@ -9,7 +9,7 @@
 /**
  * WebGL renderer plugin for tiling sprites
  */
-export class TilingSpriteRenderer extends core.ObjectRenderer {
+export default class TilingSpriteRenderer extends core.ObjectRenderer {
 
     /**
      * constructor for renderer

diff --git a/src/extras/index.js b/src/extras/index.js
index 7fe38b3..b1b793c 100644
--- a/src/extras/index.js
+++ b/src/extras/index.js
@@ -7,6 +7,7 @@
 export { default as TilingSpriteRenderer } from './webgl/TilingSpriteRenderer';
 export { default as BitmapText } from './BitmapText';
 
-export { default as cacheAsBitmap } from './cacheAsBitmap';
-export { default as getChildByName } from './getChildByName';
-export { default as getGlobalPosition } from './getGlobalPosition';
+// imported for side effect of extending the prototype only, contains no exports
+import './cacheAsBitmap';
+import './getChildByName';
+import './getGlobalPosition';
diff --git a/src/extras/webgl/TilingSpriteRenderer.js b/src/extras/webgl/TilingSpriteRenderer.js
index 2f14e89..bdf815c 100644
--- a/src/extras/webgl/TilingSpriteRenderer.js
+++ b/src/extras/webgl/TilingSpriteRenderer.js
@@ -9,7 +9,7 @@
 /**
  * WebGL renderer plugin for tiling sprites
  */
-export class TilingSpriteRenderer extends core.ObjectRenderer {
+export default class TilingSpriteRenderer extends core.ObjectRenderer {
 
     /**
      * constructor for renderer
diff --git a/src/mesh/webgl/MeshRenderer.js b/src/mesh/webgl/MeshRenderer.js
index 73d78e6..968e7a5 100644
--- a/src/mesh/webgl/MeshRenderer.js
+++ b/src/mesh/webgl/MeshRenderer.js
@@ -7,7 +7,7 @@
 /**
  * WebGL renderer plugin for tiling sprites
  */
-export class MeshRenderer extends core.ObjectRenderer {
+export default class MeshRenderer extends core.ObjectRenderer {
 
     /**
      * constructor for renderer