diff --git a/gtk/theme/HighContrast/_common.scss b/gtk/theme/HighContrast/_common.scss
index 58d28c5def..97131da022 100644
--- a/gtk/theme/HighContrast/_common.scss
+++ b/gtk/theme/HighContrast/_common.scss
@@ -1368,8 +1368,8 @@ treeview.view {
 
   &.expander {
     // GtkTreeView uses the larger of the expander’s min-width and min-height
-    min-width: 16px;
-    min-height: 16px;
+    min-width: 24px;
+    min-height: 24px;
     -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
     &:dir(rtl) { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic-rtl'); }
     color: mix($fg_color, $base_color, 70%);
@@ -2785,8 +2785,8 @@ row.activatable {
 
 expander {
   title > arrow {
-    min-width: 16px;
-    min-height: 16px;
+    min-width: 24px;
+    min-height: 24px;
     -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
     &:dir(rtl) { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic-rtl'); }
 
diff --git a/gtk/theme/HighContrast/gtk-contained-inverse.css b/gtk/theme/HighContrast/gtk-contained-inverse.css
index fd341012fc..bf92f6167f 100644
--- a/gtk/theme/HighContrast/gtk-contained-inverse.css
+++ b/gtk/theme/HighContrast/gtk-contained-inverse.css
@@ -572,7 +572,7 @@ treeview.view:backdrop { color: #fff; border-left-color: gray; border-top: #000;
 
 treeview.view.dnd { border-style: solid none; border-width: 1px; border-color: #eeeeee; }
 
-treeview.view.expander { min-width: 16px; min-height: 16px; -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); color: #b8b8b8; }
+treeview.view.expander { min-width: 24px; min-height: 24px; -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); color: #b8b8b8; }
 
 treeview.view.expander:dir(rtl) { -gtk-icon-source: -gtk-icontheme("pan-end-symbolic-rtl"); }
 
@@ -1242,7 +1242,7 @@ row:hover, row.activatable:hover { transition: none; }
 .app-notification border, .app-notification.frame border { border-width: 0; }
 
 /************* Expanders * */
-expander title > arrow { min-width: 16px; min-height: 16px; -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); }
+expander title > arrow { min-width: 24px; min-height: 24px; -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); }
 
 expander title > arrow:dir(rtl) { -gtk-icon-source: -gtk-icontheme("pan-end-symbolic-rtl"); }
 
diff --git a/gtk/theme/HighContrast/gtk-contained.css b/gtk/theme/HighContrast/gtk-contained.css
index 14cd0c6341..78dc89900b 100644
--- a/gtk/theme/HighContrast/gtk-contained.css
+++ b/gtk/theme/HighContrast/gtk-contained.css
@@ -576,7 +576,7 @@ treeview.view:backdrop { color: #000; border-left-color: gray; border-top: #fff;
 
 treeview.view.dnd { border-style: solid none; border-width: 1px; border-color: black; }
 
-treeview.view.expander { min-width: 16px; min-height: 16px; -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); color: #4d4d4d; }
+treeview.view.expander { min-width: 24px; min-height: 24px; -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); color: #4d4d4d; }
 
 treeview.view.expander:dir(rtl) { -gtk-icon-source: -gtk-icontheme("pan-end-symbolic-rtl"); }
 
@@ -1248,7 +1248,7 @@ row:hover, row.activatable:hover { transition: none; }
 .app-notification border, .app-notification.frame border { border-width: 0; }
 
 /************* Expanders * */
-expander title > arrow { min-width: 16px; min-height: 16px; -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); }
+expander title > arrow { min-width: 24px; min-height: 24px; -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); }
 
 expander title > arrow:dir(rtl) { -gtk-icon-source: -gtk-icontheme("pan-end-symbolic-rtl"); }