diff --git a/android/build.gradle b/android/build.gradle
index 145733b84..36686ba6d 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -1,5 +1,11 @@
 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 isNewArchitectureEnabled() {
     // To opt-in for the New Architecture, you can either: