diff --git a/android/build.gradle b/android/build.gradle
index 8aa2bd996..cb7698b37 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -16,7 +16,13 @@ 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"
+}
 
 rootProject.allprojects {
     repositories {