diff --git a/src/renderers/shaders/ShaderChunk/fog_fragment.glsl.js b/src/renderers/shaders/ShaderChunk/fog_fragment.glsl.js
index 996a17e149d156..d50b398c0fb0b4 100644
--- a/src/renderers/shaders/ShaderChunk/fog_fragment.glsl.js
+++ b/src/renderers/shaders/ShaderChunk/fog_fragment.glsl.js
@@ -1,6 +1,8 @@
 export default /* glsl */`
 #ifdef USE_FOG
 
+	float fogDepth = precisionSafeLength( fogPosition );
+
 	#ifdef FOG_EXP2
 
 		float fogFactor = 1.0 - exp( - fogDensity * fogDensity * fogDepth * fogDepth );
diff --git a/src/renderers/shaders/ShaderChunk/fog_pars_fragment.glsl.js b/src/renderers/shaders/ShaderChunk/fog_pars_fragment.glsl.js
index 808c7c55cc222a..abe18797b6dadb 100644
--- a/src/renderers/shaders/ShaderChunk/fog_pars_fragment.glsl.js
+++ b/src/renderers/shaders/ShaderChunk/fog_pars_fragment.glsl.js
@@ -2,7 +2,7 @@ export default /* glsl */`
 #ifdef USE_FOG
 
 	uniform vec3 fogColor;
-	varying float fogDepth;
+	varying vec3 fogPosition;
 
 	#ifdef FOG_EXP2
 
diff --git a/src/renderers/shaders/ShaderChunk/fog_pars_vertex.glsl.js b/src/renderers/shaders/ShaderChunk/fog_pars_vertex.glsl.js
index 284d460f48543b..5e64204c8e8df3 100644
--- a/src/renderers/shaders/ShaderChunk/fog_pars_vertex.glsl.js
+++ b/src/renderers/shaders/ShaderChunk/fog_pars_vertex.glsl.js
@@ -1,7 +1,7 @@
 export default /* glsl */`
 #ifdef USE_FOG
 
-	varying float fogDepth;
+	varying vec3 fogPosition;
 
 #endif
 `;
diff --git a/src/renderers/shaders/ShaderChunk/fog_vertex.glsl.js b/src/renderers/shaders/ShaderChunk/fog_vertex.glsl.js
index ecfc773911a311..0028bcbc19cfb2 100644
--- a/src/renderers/shaders/ShaderChunk/fog_vertex.glsl.js
+++ b/src/renderers/shaders/ShaderChunk/fog_vertex.glsl.js
@@ -1,7 +1,7 @@
 export default /* glsl */`
 #ifdef USE_FOG
 
-	fogDepth = -mvPosition.z;
+	fogPosition = mvPosition.xyz;
 
 #endif
 `;