diff --git a/lib/aligning_guidelines.js b/lib/aligning_guidelines.js
index 8e9a040d..87552d05 100644
--- a/lib/aligning_guidelines.js
+++ b/lib/aligning_guidelines.js
@@ -196,6 +196,8 @@ function initAligningGuidelines(canvas) {
     for (var i = horizontalLines.length; i--; ) {
       drawHorizontalLine(horizontalLines[i]);
     }
+    
+    verticalLines.length = horizontalLines.length = 0;
   });
 
   canvas.on('mouse:up', function() {