diff --git a/js/modal.js b/js/modal.js
index f8d53e2518..38fa89edd1 100644
--- a/js/modal.js
+++ b/js/modal.js
@@ -207,8 +207,7 @@
   }
 
   Modal.prototype.checkScrollbar = function () {
-    if (document.body.clientWidth >= window.innerWidth) return
-    this.scrollbarWidth = this.scrollbarWidth || this.measureScrollbar()
+    this.scrollbarWidth = this.measureScrollbar()
   }
 
   Modal.prototype.setScrollbar = function () {
@@ -221,6 +220,7 @@
   }
 
   Modal.prototype.measureScrollbar = function () { // thx walsh
+    if (document.body.clientWidth >= window.innerWidth) return 0
     var scrollDiv = document.createElement('div')
     scrollDiv.className = 'modal-scrollbar-measure'
     this.$body.append(scrollDiv)