diff --git a/APPL/Localscripts/FcltMgr.js b/APPL/Localscripts/FcltMgr.js
index 08f42d8b81..de0d51ed89 100644
--- a/APPL/Localscripts/FcltMgr.js
+++ b/APPL/Localscripts/FcltMgr.js
@@ -641,7 +641,8 @@ var FcltMgr =
             }
             // Hoeveel extra moeten we rekenen voor jQuery dialog
             var dialogborderHeight = $(frm).closest(".ui-dialog").outerHeight() - $(frm).height();
-            var dialogborderWidth = Math.ceil($(frm).closest(".ui-dialog").outerWidth() - $(frm).closest(".ui-dialog").width());
+            // 6 pixels extra marge wegens AAVL#38845
+            var dialogborderWidth = 6 + $(frm).closest(".ui-dialog").outerWidth() - $(frm).closest(".ui-dialog").width();
             $(frm).height('10px'); // Voor verkleinde/ kleine frames. Anders default minimaal 150px
             var newHeight = Math.min(frmcontent.outerHeight(), $(window).height()-100);
             // FcltMgr.alert("W:" + $(window).height());