diff --git a/js/extkeywidget.js b/js/extkeywidget.js
index 69b4677bfb..57960698e9 100644
--- a/js/extkeywidget.js
+++ b/js/extkeywidget.js
@@ -120,6 +120,7 @@ function ExtKeyWidget(id, sTargetClass, sFilter, sTitle, bSelectMode, oWizHelper
 	this.sFormAttCode = sFormAttCode;
 
 	var me = this;
+    const iDropdownContentHeightDifference = 4;
 
 	this.Init = function () {
 		// make sure that the form is clean
@@ -353,13 +354,13 @@ function ExtKeyWidget(id, sTargetClass, sFilter, sTitle, bSelectMode, oWizHelper
 
             // N°9468 Dropdown content needs to be a few pixel shorter than the dropdown itself to avoid double scrollbar
             if(oDropdownContentElem) {
-                oDropdownContentElem.css('max-height', 'calc(30vh - 4px)');
+                oDropdownContentElem.css('max-height', `calc(30vh - ${iDropdownContentHeightDifference}px)`);
             }
 
 			/* Position dropdown above input if not enough space on the bottom part of the screen
                Doesn't seem to work with selectize as an internal plugin "auto_position" refreshes the top position after
                this method is called, input set use a custom plugin to avoid fix this issue "plugin_combodo_auto_position"
-               This would need to take the potential 4px difference into account if this is fixed.
+               This would need to take the potential 4px difference (iDropdownContentHeightDifference) into account if this is fixed.
 			 */
 			if ((fDropdownTopY / fWindowHeight) > 0.6) {
                 oDropdownElem.css({
diff --git a/js/selectize/plugin_combodo_auto_position.js b/js/selectize/plugin_combodo_auto_position.js
index 129a3a4372..74d073046a 100644
--- a/js/selectize/plugin_combodo_auto_position.js
+++ b/js/selectize/plugin_combodo_auto_position.js
@@ -19,6 +19,7 @@ Selectize.define("combodo_auto_position", function (aOptions) {
 
 	// Selectize instance
 	let oSelf = this;
+    const iDropdownContentHeightDifference = 4;
 
 	// Plugin options
 	aOptions = $.extend({
@@ -53,7 +54,7 @@ Selectize.define("combodo_auto_position", function (aOptions) {
                 iDropdownHeight = oSelf.$dropdown.outerHeight();
 
                 oSelf.$dropdown.css({
-                    top: oSelf.$control.offset().top - iDropdownHeight + 4, // Content will be shorter, so our real height too
+                    top: oSelf.$control.offset().top - iDropdownHeight + iDropdownContentHeightDifference, // Content will be shorter, so our real height too
                     left: oSelf.$control.offset().left,
 					width: oSelf.$wrapper.outerWidth(),
 					overflowY: 'auto',
@@ -62,7 +63,7 @@ Selectize.define("combodo_auto_position", function (aOptions) {
 
                 // N°9468 Dropdown content needs to be a few pixel shorter than the dropdown itself to avoid double scrollbar
                 oSelf.$dropdown_content.css({
-                    'max-height': `calc(${aOptions.maxDropDownHeight} - 4px)`
+                    'max-height': `calc(${aOptions.maxDropDownHeight} - ${iDropdownContentHeightDifference}px)`
                 });
 
 			}