diff --git a/schemas/org.gnome.desktop.interface.gschema.xml.in b/schemas/org.gnome.desktop.interface.gschema.xml.in
index a9987083591ee7ef48071e412cfac578dd136689..7782323d6fce78bbf13386a43d207f5e4c22fd76 100644
--- a/schemas/org.gnome.desktop.interface.gschema.xml.in
+++ b/schemas/org.gnome.desktop.interface.gschema.xml.in
@@ -208,7 +208,8 @@
       <description>A “\n” separated list of “name:color” as defined by the “gtk-color-scheme” setting</description>
     </key>
     <key name="clock-format" enum="org.gnome.desktop.GDesktopClockFormat">
-      <default>'24h'</default>
+      <!-- TRANSLATORS: select your locale's default clock format, this should be '12h' or '24h' (with the quotes!) -->
+      <default l10n="time">'12h'</default>
       <summary>Whether the clock displays in 24h or 12h format</summary>
       <description>
         Whether the clock displays in 24h or 12h format