diff --git a/src/renderers/shaders/ShaderChunk/transmission_fragment.glsl.js b/src/renderers/shaders/ShaderChunk/transmission_fragment.glsl.js
index 228bcfaf79fcfe..65d686318ad756 100644
--- a/src/renderers/shaders/ShaderChunk/transmission_fragment.glsl.js
+++ b/src/renderers/shaders/ShaderChunk/transmission_fragment.glsl.js
@@ -10,7 +10,7 @@ export default /* glsl */`
 
 	#endif
 
-	#ifdef USE_THICKNESSNMAP
+	#ifdef USE_THICKNESSMAP
 
 		thicknessFactor *= texture2D( thicknessMap, vUv ).g;