diff --git a/android/build.gradle b/android/build.gradle
index 41ba48c..5cfb557 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -16,7 +16,15 @@ 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'". Asking for the extension covers
+// every way built-in Kotlin can be turned on -- the global default, the
+// android.builtInKotlin property, and the per-module com.android.built-in-kotlin
+// plugin -- without reading an AGP version number.
+if (project.extensions.findByName('kotlin') == null) {
+  apply plugin: 'kotlin-android'
+}
 
 def getExtOrDefault(name) {
   return rootProject.ext.has(name) ? rootProject.ext.get(name) : project.properties['RiveReactNative_' + name]