diff --git a/example/screenShader.frag b/example/screenShader.frag
index 5eeac17a7..71598e51b 100644
--- a/example/screenShader.frag
+++ b/example/screenShader.frag
@@ -1,16 +1,19 @@
 //
 // Example blue light filter shader.
-// 
+//
+
+#version 300 es
 
 precision mediump float;
-varying vec2 v_texcoord;
+in vec2 v_texcoord;
+layout(location = 0) out vec4 fragColor;
 uniform sampler2D tex;
 
 void main() {
 
-    vec4 pixColor = texture2D(tex, v_texcoord);
+    vec4 pixColor = texture(tex, v_texcoord);
 
     pixColor[2] *= 0.8;
 
-    gl_FragColor = pixColor;
+    fragColor = pixColor;
 }