diff --git a/src/data/ui/TimeChooser.ui b/src/data/ui/TimeChooser.ui
index 07d50ae..7ef9209 100644
--- a/src/data/ui/TimeChooser.ui
+++ b/src/data/ui/TimeChooser.ui
@@ -109,8 +109,8 @@ SPDX-License-Identifier: GPL-3.0-or-later
     </child>
   </template>
   <object class="GtkAdjustment" id="hours_12_adjustment">
-    <property name="lower">0</property>
-    <property name="upper">11</property>
+    <property name="lower">1</property>
+    <property name="upper">12</property>
     <property name="step-increment">1</property>
   </object>
   <object class="GtkAdjustment" id="hours_24_adjustment">