diff --git a/.changeset/few-ghosts-enjoy.md b/.changeset/few-ghosts-enjoy.md
new file mode 100644
index 000000000..93e38d013
--- /dev/null
+++ b/.changeset/few-ghosts-enjoy.md
@@ -0,0 +1,5 @@
+---
+'@phantom/react-native-webview': patch
+---
+
+Add isMainFrame to new arch serialization layer
diff --git a/apple/RNCWebView.mm b/apple/RNCWebView.mm
index 95c0fcc91..32b96540f 100644
--- a/apple/RNCWebView.mm
+++ b/apple/RNCWebView.mm
@@ -134,7 +134,8 @@ - (instancetype)initWithFrame:(CGRect)frame
                     .canGoBack = static_cast<bool>([[dictionary valueForKey:@"canGoBack"] boolValue]),
                     .canGoForward = static_cast<bool>([[dictionary valueForKey:@"canGoForward"] boolValue]),
                     .loading = static_cast<bool>([[dictionary valueForKey:@"loading"] boolValue]),
-                    .data = std::string([[dictionary valueForKey:@"data"] UTF8String])
+                    .data = std::string([[dictionary valueForKey:@"data"] UTF8String]),
+                    .isMainFrame = static_cast<bool>([[dictionary valueForKey:@"isMainFrame"] boolValue])
                 };
                 webViewEventEmitter->onMessage(data);
             }