diff --git a/packages/react-native-audio-api/android/build.gradle b/packages/react-native-audio-api/android/build.gradle
index 8305f9c7d..8941bf813 100644
--- a/packages/react-native-audio-api/android/build.gradle
+++ b/packages/react-native-audio-api/android/build.gradle
@@ -31,7 +31,13 @@ def isStaticExternalLibsDisabled() {
 }
 
 apply plugin: "com.android.library"
-apply plugin: 'org.jetbrains.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: 'org.jetbrains.kotlin.android'
+}
 
 if (isNewArchitectureEnabled()) {
   apply plugin: "com.facebook.react"
diff --git a/packages/react-native-audio-worklets/android/build.gradle b/packages/react-native-audio-worklets/android/build.gradle
index cf04cc9b6..7036fbd8f 100644
--- a/packages/react-native-audio-worklets/android/build.gradle
+++ b/packages/react-native-audio-worklets/android/build.gradle
@@ -67,7 +67,13 @@ def supportsNamespace() {
 }
 
 apply plugin: "com.android.library"
-apply plugin: "org.jetbrains.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: "org.jetbrains.kotlin.android"
+}
 
 apply plugin: "com.facebook.react"