diff --git a/packages/react-native-executorch-webrtc/android/build.gradle b/packages/react-native-executorch-webrtc/android/build.gradle
index 919f9d2666..8a65360122 100644
--- a/packages/react-native-executorch-webrtc/android/build.gradle
+++ b/packages/react-native-executorch-webrtc/android/build.gradle
@@ -13,7 +13,13 @@ buildscript {
 }
 
 apply plugin: 'com.android.library'
-apply plugin: 'kotlin-android'
+// AGP 9 ships built-in Kotlin support and registers the `kotlin` extension
+// itself. Applying the Kotlin plugin on top of it fails configuration with
+// "Cannot add extension with name 'kotlin'". Only apply it when nothing has
+// registered that extension yet.
+if (project.extensions.findByName('kotlin') == null) {
+    apply plugin: 'kotlin-android'
+}
 
 android {
     namespace 'com.executorch.webrtc'
diff --git a/packages/react-native-executorch/android/build.gradle b/packages/react-native-executorch/android/build.gradle
index be4a2f5373..f36b80e302 100644
--- a/packages/react-native-executorch/android/build.gradle
+++ b/packages/react-native-executorch/android/build.gradle
@@ -34,7 +34,14 @@ def reactNativeArchitectures() {
 }
 
 apply plugin: "com.android.library"
-apply plugin: "kotlin-android"
+// AGP 9 ships built-in Kotlin support and registers the `kotlin` extension
+// itself. Applying the Kotlin plugin on top of it fails configuration with
+// "Cannot add extension with name 'kotlin'". Only apply it when nothing has
+// registered that extension yet.
+if (project.extensions.findByName('kotlin') == null) {
+  apply plugin: "kotlin-android"
+}
+
 apply plugin: "com.facebook.react"