diff --git a/lib/flutter_linkify.dart b/lib/flutter_linkify.dart
index 741fc05..2af0305 100644
--- a/lib/flutter_linkify.dart
+++ b/lib/flutter_linkify.dart
@@ -54,7 +54,7 @@ class Linkify extends StatelessWidget {
   final TextOverflow? overflow;
 
   /// The number of font pixels for each logical pixel
-  final double textScaleFactor;
+  final double? textScaleFactor;
 
   /// Whether the text should break at soft line breaks.
   final bool softWrap;
@@ -88,7 +88,7 @@ class Linkify extends StatelessWidget {
     this.textDirection,
     this.maxLines,
     this.overflow = TextOverflow.clip,
-    this.textScaleFactor = 1.0,
+    this.textScaleFactor = null,
     this.softWrap = true,
     this.strutStyle,
     this.locale,
@@ -138,7 +138,7 @@ class SelectableLinkify extends StatelessWidget {
   final String text;
 
   /// The number of font pixels for each logical pixel
-  final double textScaleFactor;
+  final double? textScaleFactor;
 
   /// Linkifiers to be used for linkify
   final List<Linkifier> linkifiers;
@@ -242,7 +242,7 @@ class SelectableLinkify extends StatelessWidget {
     this.maxLines,
     // SelectableText
     this.focusNode,
-    this.textScaleFactor = 1.0,
+    this.textScaleFactor = null,
     this.strutStyle,
     this.showCursor = false,
     this.autofocus = false,