diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index 4d231d44742..f07f4a52d50 100644
--- a/addons/web/static/src/css/base.css
+++ b/addons/web/static/src/css/base.css
@@ -1544,9 +1544,6 @@ label.error {
     margin-bottom: -4px;
     cursor: pointer;
 }
-.openerp .oe-m2o-cm-button img {
-    margin-left: 4px;
-}
 .openerp .oe-m2o-disabled-cm {
     color: grey;
 }