diff --git a/src/extras/helpers/ArrowHelper.js b/src/extras/helpers/ArrowHelper.js
index 31552e8d885c6620746e7914c0aa5ed9f5186acb..585562d6b30bab70ca235b57ddf4a12b94be20ed 100644
--- a/src/extras/helpers/ArrowHelper.js
+++ b/src/extras/helpers/ArrowHelper.js
@@ -56,11 +56,11 @@ THREE.ArrowHelper.prototype.setDirection = function () {
 
 		// dir is assumed to be normalized
 
-		if ( dir.y > 0.999 ) {
+		if ( dir.y > 0.99999 ) {
 
 			this.quaternion.set( 0, 0, 0, 1 );
 
-		} else if ( dir.y < - 0.999 ) {
+		} else if ( dir.y < - 0.99999 ) {
 
 			this.quaternion.set( 1, 0, 0, 0 );