diff --git a/widgets/mainwindow.ui b/widgets/mainwindow.ui
index 4779fb20b..5ade13659 100644
--- a/widgets/mainwindow.ui
+++ b/widgets/mainwindow.ui
@@ -741,7 +741,7 @@ QPushButton[state="ok"] {
                     <string>F Tol  </string>
                    </property>
                    <property name="minimum">
-                    <number>10</number>
+                    <number>1</number>
                    </property>
                    <property name="maximum">
                     <number>1000</number>