diff --git a/src/qtk/shaders.h b/src/qtk/shaders.h
index 2dc6ff4..57c5a45 100644
--- a/src/qtk/shaders.h
+++ b/src/qtk/shaders.h
@@ -109,11 +109,12 @@ void main()
 #version 330
 uniform samplerCube uTexture;
 
-varying vec3 vTexCoord;
+in vec3 vTexCoord;
+out vec4 FragColor;
 
 void main()
 {
-  gl_FragColor = texture(uTexture, vTexCoord);
+  FragColor = texture(uTexture, vTexCoord);
 }
 )"