diff --git a/packages/react-native-quick-crypto/android/build.gradle b/packages/react-native-quick-crypto/android/build.gradle
index 4e32c5af..7d2a59d4 100644
--- a/packages/react-native-quick-crypto/android/build.gradle
+++ b/packages/react-native-quick-crypto/android/build.gradle
@@ -22,7 +22,14 @@ def isNewArchitectureEnabled() {
 }
 
 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 from: "../nitrogen/generated/android/QuickCrypto+autolinking.gradle"
 
 if (isNewArchitectureEnabled()) {