diff --git a/lib/ui/text.dart b/lib/ui/text.dart
index 8a03b68c68fa1..4e9c97cca2f95 100644
--- a/lib/ui/text.dart
+++ b/lib/ui/text.dart
@@ -2242,7 +2242,7 @@ class ParagraphBuilder extends NativeFieldWrapperClass2 {
     _placeholderCount++;
     _placeholderScales.add(scale);
   }
-  String _addPlaceholder(double width, double height, int alignment, double baselineOffset, int? baseline) native 'ParagraphBuilder_addPlaceholder';
+  String? _addPlaceholder(double width, double height, int alignment, double baselineOffset, int? baseline) native 'ParagraphBuilder_addPlaceholder';
 
   /// Applies the given paragraph style and returns a [Paragraph] containing the
   /// added text and associated styling.