diff --git a/js/src/modal.js b/js/src/modal.js
index 1b8363c01..c06374d74 100644
--- a/js/src/modal.js
+++ b/js/src/modal.js
@@ -462,7 +462,7 @@ class Modal extends BaseComponent {
       // Adjust fixed content padding
       SelectorEngine.find(SELECTOR_FIXED_CONTENT)
         .forEach(element => {
-          if (window.innerWidth > element.clientWidth + this._scrollbarWidth) {
+          if (this._isShorterThanWindow(element)) {
             return
           }
 
@@ -475,7 +475,7 @@ class Modal extends BaseComponent {
       // Adjust sticky content margin
       SelectorEngine.find(SELECTOR_STICKY_CONTENT)
         .forEach(element => {
-          if (window.innerWidth > element.clientWidth + this._scrollbarWidth) {
+          if (this._isShorterThanWindow(element)) {
             return
           }
 
@@ -536,6 +536,10 @@ class Modal extends BaseComponent {
     return scrollbarWidth
   }
 
+  _isShorterThanWindow(element) {
+    return window.innerWidth > element.clientWidth + this._scrollbarWidth
+  }
+
   // Static
 
   static jQueryInterface(config, relatedTarget) {