diff --git a/src/gui/symbology/qgsgraduatedsymbolrendererwidget.cpp b/src/gui/symbology/qgsgraduatedsymbolrendererwidget.cpp
index 5c40bddc46d..0dfe1ab5e1e 100644
--- a/src/gui/symbology/qgsgraduatedsymbolrendererwidget.cpp
+++ b/src/gui/symbology/qgsgraduatedsymbolrendererwidget.cpp
@@ -818,6 +818,11 @@ void QgsGraduatedSymbolRendererWidget::refreshRanges( bool reset )
     return;
 
   mModel->updateSymbology( reset );
+
+  disconnectUpdateHandlers();
+  spinGraduatedClasses->setValue( mRenderer->ranges().count() );
+  connectUpdateHandlers();
+
   emit widgetChanged();
 }