diff --git a/src/prefs.ui b/src/prefs.ui
index 7aada3a3..c8a0cfab 100644
--- a/src/prefs.ui
+++ b/src/prefs.ui
@@ -9,7 +9,7 @@
       <property name="page_increment">10</property>
     </object>
     <object class="GtkAdjustment" id="sigma_adjustment">
-      <property name="upper">100</property>
+      <property name="upper">150</property>
       <property name="step_increment">1</property>
       <property name="page_increment">10</property>
     </object>