diff --git a/android/build.gradle b/android/build.gradle
index 4d1faae..a500290 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -15,7 +15,13 @@ 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'
+}
 
 def getExtOrDefault(name) {
   return rootProject.ext.has(name) ? rootProject.ext.get(name) : project.properties['LivekitReactNative_' + name]