diff --git a/sdrbase/gui/glscopegui.ui b/sdrbase/gui/glscopegui.ui
index 5b52087a3..73142f302 100644
--- a/sdrbase/gui/glscopegui.ui
+++ b/sdrbase/gui/glscopegui.ui
@@ -728,7 +728,7 @@
           <number>-100</number>
          </property>
          <property name="maximum">
-          <number>100</number>
+          <number>99</number>
          </property>
          <property name="pageStep">
           <number>1</number>