diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index 859cb9bffbaba3..e3e2ca37734910 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -11,7 +11,7 @@ import {
 	NoToneMapping,
 	LinearMipmapLinearFilter
 } from '../constants.js';
-import { floorPowerOfTwo } from '../math/MathUtils';
+import { floorPowerOfTwo } from '../math/MathUtils.js';
 import { Frustum } from '../math/Frustum.js';
 import { Matrix4 } from '../math/Matrix4.js';
 import { Vector2 } from '../math/Vector2.js';