diff --git a/packages/webview_flutter/CHANGELOG.md b/packages/webview_flutter/CHANGELOG.md
index 75b2bf4997fc..95aa37b09fbe 100644
--- a/packages/webview_flutter/CHANGELOG.md
+++ b/packages/webview_flutter/CHANGELOG.md
@@ -1,6 +1,10 @@
 ## 0.3.13
 
 * Add an optional `userAgent` property to set a custom User Agent.
+
+## 0.3.13+1
+
+* Allow underscore in the JavaScript channel names.
   
 ## 0.3.12+1
 
diff --git a/packages/webview_flutter/lib/webview_flutter.dart b/packages/webview_flutter/lib/webview_flutter.dart
index 97b7786de9a6..92f788eb7769 100644
--- a/packages/webview_flutter/lib/webview_flutter.dart
+++ b/packages/webview_flutter/lib/webview_flutter.dart
@@ -91,7 +91,7 @@ enum AutoMediaPlaybackPolicy {
   always_allow,
 }
 
-final RegExp _validChannelNames = RegExp('^[a-zA-Z_][a-zA-Z0-9]*\$');
+final RegExp _validChannelNames = RegExp('^[a-zA-Z_][a-zA-Z0-9_]*\$');
 
 /// A named channel for receiving messaged from JavaScript code running inside a web view.
 class JavascriptChannel {
diff --git a/packages/webview_flutter/test/webview_flutter_test.dart b/packages/webview_flutter/test/webview_flutter_test.dart
index d3f289018073..6122d0d87c42 100644
--- a/packages/webview_flutter/test/webview_flutter_test.dart
+++ b/packages/webview_flutter/test/webview_flutter_test.dart
@@ -454,6 +454,7 @@ void main() {
     final JavascriptMessageHandler noOp = (JavascriptMessage msg) {};
     JavascriptChannel(name: 'Tts1', onMessageReceived: noOp);
     JavascriptChannel(name: '_Alarm', onMessageReceived: noOp);
+    JavascriptChannel(name: 'foo_bar1_', onMessageReceived: noOp);
 
     VoidCallback createChannel(String name) {
       return () {