diff --git a/src/calibre/gui2/bars.py b/src/calibre/gui2/bars.py
index f9070b39c2..44f063bc45 100644
--- a/src/calibre/gui2/bars.py
+++ b/src/calibre/gui2/bars.py
@@ -820,7 +820,7 @@ class BarsManager(QObject):
 
     def apply_settings(self):
         sz = gprefs['toolbar_icon_size']
-        sz = {'off':0, 'small':24, 'medium':48, 'large':64}[sz]
+        sz = {'off':0, 'small':24, 'mid-small':30, 'medium':48, 'large':64}[sz]
         style = Qt.ToolButtonStyle.ToolButtonTextUnderIcon
         if sz > 0 and gprefs['toolbar_text'] == 'never':
             style = Qt.ToolButtonStyle.ToolButtonIconOnly
diff --git a/src/calibre/gui2/preferences/look_feel.py b/src/calibre/gui2/preferences/look_feel.py
index 8449d5ae50..be3682914b 100644
--- a/src/calibre/gui2/preferences/look_feel.py
+++ b/src/calibre/gui2/preferences/look_feel.py
@@ -714,7 +714,7 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         r('cb_double_click_to_activate', gprefs)
 
         choices = [(_('Off'), 'off'), (_('Small'), 'small'),
-            (_('Medium'), 'medium'), (_('Large'), 'large')]
+            (_('Mid-small'), 'mid-small'), (_('Medium'), 'medium'), (_('Large'), 'large')]
         r('toolbar_icon_size', gprefs, choices=choices)
 
         choices = [(_('If there is enough room'), 'auto'), (_('Always'), 'always'),