diff --git a/cocos2dx/shaders/ccShader_PositionColorLengthTexture_frag.h b/cocos2dx/shaders/ccShader_PositionColorLengthTexture_frag.h
index ab908d6eb9..803664a506 100644
--- a/cocos2dx/shaders/ccShader_PositionColorLengthTexture_frag.h
+++ b/cocos2dx/shaders/ccShader_PositionColorLengthTexture_frag.h
@@ -21,7 +21,7 @@
 
 "																															\n\
 #ifdef GL_ES																												\n\
-#extension GL_OES_standard_derivatives : enable																				\n\
+// #extension GL_OES_standard_derivatives : enable																			\n\
 																															\n\
 varying mediump vec4 v_color;																								\n\
 varying mediump vec2 v_texcoord;																							\n\
@@ -32,10 +32,10 @@ varying vec2 v_texcoord;																									\n\
 																															\n\
 void main()																													\n\
 {																															\n\
-#if defined GL_OES_standard_derivatives																						\n\
-	gl_FragColor = v_color*smoothstep(0.0, length(fwidth(v_texcoord)), 1.0 - length(v_texcoord));							\n\
-#else																														\n\
+// #if defined GL_OES_standard_derivatives																						\n\
+	// gl_FragColor = v_color*smoothstep(0.0, length(fwidth(v_texcoord)), 1.0 - length(v_texcoord));							\n\
+// #else																														\n\
 	gl_FragColor = v_color*step(0.0, 1.0 - length(v_texcoord));																\n\
-#endif																														\n\
+// #endif																														\n\
 }																															\n\
 ";