diff --git a/android/build.gradle b/android/build.gradle
index 81ec0d4b..50e0cf53 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -22,7 +22,15 @@ def isNewArchitectureEnabled() {
 }
 
 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"
+}
 
 if (isNewArchitectureEnabled()) {
   apply plugin: "com.facebook.react"