diff --git a/lib/src/widgets/toolbar.dart b/lib/src/widgets/toolbar.dart
index 35da0bfb..38bd8083 100644
--- a/lib/src/widgets/toolbar.dart
+++ b/lib/src/widgets/toolbar.dart
@@ -198,7 +198,6 @@ class QuillToolbar extends StatelessWidget implements PreferredSizeWidget {
                 ),
             ],
             onSelected: (newSize) {
-              controller.formatSelection(
               if (newSize == '0') {
                 controller.formatSelection(
                     Attribute.fromKeyValue('size', null));