diff --git a/src/core/Raycaster.js b/src/core/Raycaster.js
index 2432e0353e5352ec40cf9c424fb1bde14098525b..7243c63183fcc98023fcbf3d3e2ec45df7d6c56c 100644
--- a/src/core/Raycaster.js
+++ b/src/core/Raycaster.js
@@ -328,10 +328,9 @@
 
 				} else {
 
-					var offsets = geometry.offsets;
 					var positions = attributes.position.array;
 
-					for ( var i = 0, il = attributes.position.array.length; i < il; i += 3 ) {
+					for ( var i = 0, il = positions.length / 3; i < il; i += 3 ) {
 
 						a = i;
 						b = i + 1;