diff --git a/Shaders/include_fog.frag b/Shaders/include_fog.frag
index 69dc17257..3837f8358 100644
--- a/Shaders/include_fog.frag
+++ b/Shaders/include_fog.frag
@@ -6,7 +6,7 @@ vec3 fog_Func(vec3 color, int type)
 	//if (type == 0){
 		const float LOG2 = 1.442695;
 		//float fogCoord =length(PointPos);
-		float fogCoord = gl_FragCoord.z / gl_FragCoord.w;
+		float fogCoord = gl_ProjectionMatrix[3].z/(gl_FragCoord.z * -2.0 + 1.0 - gl_ProjectionMatrix[2].z);
 		float fogFactor = exp2(-gl_Fog.density * gl_Fog.density * fogCoord * fogCoord * LOG2);
 
 		if(gl_Fog.density == 1.0)