diff --git a/vcv/src/main/java/com/ccc/vcv/VerificationCodeView.kt b/vcv/src/main/java/com/ccc/vcv/VerificationCodeView.kt
index e9b50e1..32a17df 100644
--- a/vcv/src/main/java/com/ccc/vcv/VerificationCodeView.kt
+++ b/vcv/src/main/java/com/ccc/vcv/VerificationCodeView.kt
@@ -464,6 +464,6 @@ class VerificationCodeView : AppCompatEditText {
 
     interface OnInputVerificationCodeListener {
         fun onInputVerificationCodeComplete()
-        fun onInputVerificationCodeUnComplete()
+        fun onInputVerificationCodeUnComplete() = Unit
     }
 }