diff --git a/addons/base/static/src/css/base.css b/addons/base/static/src/css/base.css
index b766bdb2130..1dab02f37c1 100644
--- a/addons/base/static/src/css/base.css
+++ b/addons/base/static/src/css/base.css
@@ -474,9 +474,10 @@ background: linear-gradient(top, #ffffff 0%,#d8d8d8 11%,#afafaf 86%,#333333 91%,
     background: #AAAAAA;
 }
 .openerp .filter_icon {
+    height: 22px;
     padding: 1px 2px 0 2px;
-    margin-left: 0;
-    margin-right: 0;
+    margin: 0;
+    vertical-align: bottom;
 }
 .openerp .filter_label {
     font-weight: bold;