diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index 7ecb91f7c7b6cf4823a3e8bbb00cecbed1bb77de..133db34ef98833234a319a405fc39ce8ec0d5f90 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -1463,7 +1463,7 @@ function WebGLRenderer( parameters ) {
 			releaseMaterialProgramReference( material );
 
 		} else if ( lightsHash.stateID !== lightsStateHash.stateID ||
-			lightsHash.value !== lightsStateHash.directionalLength ) {
+			lightsHash.value !== lightsStateHash.value ) {
 
 			lightsHash.stateID = lightsStateHash.stateID;
 			lightsHash.value = lightsStateHash.value;