diff --git a/HISTORY.md b/HISTORY.md
index 100db8c..e8427a0 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,6 +2,11 @@
 
 https://github.com/josdejong/jsoneditor
 
+## 2019-08-28, version 6.4.1
+
+- Fix styling of autocompletion dropdown broken. Regression since `v6.4.0`.
+
+
 ## 2019-08-28, version 6.4.0
 
 - Replaces CSS with SASS internally, improvements in styling. Thanks @ppetkow.
diff --git a/src/js/autocomplete.js b/src/js/autocomplete.js
index e4e2640..0232a6c 100644
--- a/src/js/autocomplete.js
+++ b/src/js/autocomplete.js
@@ -38,8 +38,9 @@ function completely(config) {
         var ix = 0;
         var oldIndex = -1;
 
-        var onMouseOver = function () { this.style.outline = '1px solid #ddd'; }
-        var onMouseOut = function () { this.style.outline = '0'; }
+        // TODO: move this styling in JS to SCSS
+        var onMouseOver = function () { this.style.backgroundColor = '#ddd'; }
+        var onMouseOut = function () { this.style.backgroundColor = ''; }
         var onMouseDown = function () { p.hide(); p.onmouseselection(this.__hint, p.rs); }
 
         var p = {
@@ -103,7 +104,7 @@ function completely(config) {
                 if (oldIndex != -1 && rows[oldIndex]) {
                     rows[oldIndex].className = "item";
                 }
-                rows[index].className = "item hover"; 
+                rows[index].className = "item hover";
                 oldIndex = index;
             },
             move: function (step) { // moves the selection either up or down (unless it's not possible) step is either +1 or -1.
diff --git a/src/scss/autocomplete.scss b/src/scss/autocomplete.scss
index fd3624c..870d721 100644
--- a/src/scss/autocomplete.scss
+++ b/src/scss/autocomplete.scss
@@ -1,7 +1,7 @@
 @import "styles";
 
 .jsoneditor {
-  &.autocomplete {
+  .autocomplete {
     &.dropdown {
       position: absolute;
       background: $jse-white;
@@ -12,8 +12,7 @@
       overflow-y: auto;
       cursor: default;
       margin: 0;
-      padding-left: 2pt;
-      padding-right: 5pt;
+      padding: 5px;
       text-align: left;
       outline: 0;
       font-family: $jse-font-mono;