diff --git a/src/com/android/settings/biometrics2/ui/view/FingerprintEnrollmentActivity.kt b/src/com/android/settings/biometrics2/ui/view/FingerprintEnrollmentActivity.kt
index b81621f87fe..ec965970699 100644
--- a/src/com/android/settings/biometrics2/ui/view/FingerprintEnrollmentActivity.kt
+++ b/src/com/android/settings/biometrics2/ui/view/FingerprintEnrollmentActivity.kt
@@ -140,7 +140,7 @@ open class FingerprintEnrollmentActivity : FragmentActivity() {
         action?.let { onEnrollingAction(it) }
     }
 
-    private val finishActionObserver = Observer<Int> { action ->
+    private val finishActionObserver = Observer<Int?> { action ->
         if (DEBUG) {
             Log.d(TAG, "finishActionObserver($action)")
         }