diff --git a/licensee-for-android-core/src/main/kotlin/io/github/usefulness/licensee/Poko.kt b/licensee-for-android-core/src/main/kotlin/io/github/usefulness/licensee/Poko.kt
index ec918b2..2b2a2be 100644
--- a/licensee-for-android-core/src/main/kotlin/io/github/usefulness/licensee/Poko.kt
+++ b/licensee-for-android-core/src/main/kotlin/io/github/usefulness/licensee/Poko.kt
@@ -1,3 +1,4 @@
 package io.github.usefulness.licensee
 
+@Retention(value = AnnotationRetention.SOURCE)
 internal annotation class Poko