diff --git a/wadsrc/static/shaders/glsl/main.fp b/wadsrc/static/shaders/glsl/main.fp
index e26b2fd4a..5ab9f1118 100644
--- a/wadsrc/static/shaders/glsl/main.fp
+++ b/wadsrc/static/shaders/glsl/main.fp
@@ -287,7 +287,7 @@ vec3 AmbientOcclusionColor()
 	}
 	else 
 	{
-		fogdist = max(16.0, length(pixelpos.xyz));
+		fogdist = max(16.0, distance(pixelpos.xyz, uCameraPos.xyz));
 	}
 	fogfactor = exp2 (uFogDensity * fogdist);