diff --git a/src/gui/mainwindow.ui b/src/gui/mainwindow.ui
index baca01d..a77a297 100644
--- a/src/gui/mainwindow.ui
+++ b/src/gui/mainwindow.ui
@@ -112,7 +112,11 @@
             </widget>
            </item>
            <item>
-            <widget class="QDoubleSpinBox" name="givenSpinBox"/>
+            <widget class="QDoubleSpinBox" name="givenSpinBox">
+             <property name="maximum">
+              <double>999.990000000000009</double>
+             </property>
+            </widget>
            </item>
            <item>
             <widget class="QLabel" name="label_4">