diff --git a/src/mol-gl/shader/chunks/apply-fog.glsl b/src/mol-gl/shader/chunks/apply-fog.glsl
index 9e176cbaa6c52918811d3493e139614abad5e4a0..0dcfbd63f071203c4e9f75c94fe7c25c352c5a55 100644
--- a/src/mol-gl/shader/chunks/apply-fog.glsl
+++ b/src/mol-gl/shader/chunks/apply-fog.glsl
@@ -1,6 +1,6 @@
-// #ifdef dUseFog
+#ifdef dUseFog
 	float depth = length(vViewPosition);
     // float depth = gl_FragCoord.z / gl_FragCoord.w;
     float fogFactor = smoothstep(uFogNear, uFogFar, depth);
 	gl_FragColor.rgb = mix(gl_FragColor.rgb, uFogColor, fogFactor);
-// #endif
\ No newline at end of file
+#endif
\ No newline at end of file