diff --git a/themes/classic/global/win/menu.css b/themes/classic/global/win/menu.css
index 46eea64d3fde..06b9635b35b0 100644
--- a/themes/classic/global/win/menu.css
+++ b/themes/classic/global/win/menu.css
@@ -277,7 +277,6 @@ menuseparator {
 menulist > menupopup > menuseparator,
 .menulist-menupopup > menuseparator {
   margin: 2px 0;
-  border-top: 1px solid #000000;
   border-bottom: none;
 }
 
diff --git a/themes/modern/global/menu.css b/themes/modern/global/menu.css
index 63d4a8469e39..896b7d488e3f 100644
--- a/themes/modern/global/menu.css
+++ b/themes/modern/global/menu.css
@@ -231,7 +231,6 @@ menuseparator {
 menulist > menupopup > menuseparator,
 .menulist-menupopup > menuseparator {
   margin: 2px 0;
-  border-top: 1px solid #000000;
   border-bottom: none;
 }