diff --git a/ui/format_dialog.ui b/ui/format_dialog.ui
--- a/ui/format_dialog.ui
+++ b/ui/format_dialog.ui
@@ -32,7 +32,11 @@
    <item>
     <layout class="QGridLayout" name="gridLayout">
      <item row="1" column="1">
-      <widget class="QSpinBox" name="sb_to"/>
+      <widget class="QSpinBox" name="sb_to">
+       <property name="maximum">
+        <number>999</number>
+       </property>
+      </widget>
      </item>
      <item row="0" column="1">
       <widget class="QLabel" name="label_2">