diff --git a/gtk/theme/HighContrast/_common.scss b/gtk/theme/HighContrast/_common.scss
index 07ead107df..893d0efb48 100644
--- a/gtk/theme/HighContrast/_common.scss
+++ b/gtk/theme/HighContrast/_common.scss
@@ -1063,6 +1063,7 @@ column-header {
   border-color: $bg_color;
   text-shadow: none;
   &:insensitive {
+    border-width: 0 1px 1px 0;
     border-color: $bg_color;
     background-image: none;
   }
@@ -1072,6 +1073,7 @@ column-header {
     color: mix($backdrop_fg_color, $backdrop_bg_color,50%);
     background-image: none;
     &:insensitive {
+      border-width: 0 1px 1px 0;
       border-color: $backdrop_bg_color;
       background-image: none;
     }
diff --git a/gtk/theme/HighContrast/gtk.css b/gtk/theme/HighContrast/gtk.css
index 6152865691..1d4b653dd1 100644
--- a/gtk/theme/HighContrast/gtk.css
+++ b/gtk/theme/HighContrast/gtk.css
@@ -1277,6 +1277,7 @@ column-header .button, column-header .button:hover, column-header .button:active
   border-color: #fff;
   text-shadow: none; }
   column-header .button:insensitive {
+    border-width: 0 1px 1px 0;
     border-color: #fff;
     background-image: none; }
   column-header .button:backdrop {
@@ -1285,6 +1286,7 @@ column-header .button, column-header .button:hover, column-header .button:active
     color: #7f7f7f;
     background-image: none; }
     column-header .button:backdrop:insensitive {
+      border-width: 0 1px 1px 0;
       border-color: #fff;
       background-image: none; }