diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index 8dbd98f6..554cccdc 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -4844,7 +4844,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 			_gl.bindTexture( _gl.TEXTURE_2D, texture.__webglTexture );
 
-			if ( texture.constructor == THREE.DataTexture) {
+			if ( texture instanceof THREE.DataTexture) {
 
 				_gl.texImage2D( _gl.TEXTURE_2D, 0, paramThreeToGL( texture.format ), texture.image.width, texture.image.height, 0, paramThreeToGL( texture.format ), _gl.UNSIGNED_BYTE, texture.image.data );