diff --git a/src/core/renderers/webgl/WebGLRenderer.js b/src/core/renderers/webgl/WebGLRenderer.js
index bb31404..0816ee7 100644
--- a/src/core/renderers/webgl/WebGLRenderer.js
+++ b/src/core/renderers/webgl/WebGLRenderer.js
@@ -338,6 +338,8 @@
 {
     SystemRenderer.prototype.resize.call(this, width, height);
 
+    this.gl.viewport(0, 0, this.width, this.height);
+
     this.filterManager.resize(width, height);
     this.renderTarget.resize(width, height);