diff --git a/build/shared/examples/10.StarterKit/p12_KnockLock/p12_KnockLock.ino b/build/shared/examples/10.StarterKit/p12_KnockLock/p12_KnockLock.ino
index f6586c17b..042cdec8e 100644
--- a/build/shared/examples/10.StarterKit/p12_KnockLock/p12_KnockLock.ino
+++ b/build/shared/examples/10.StarterKit/p12_KnockLock/p12_KnockLock.ino
@@ -140,6 +140,8 @@ void loop() {
       digitalWrite(greenLed, HIGH);
       digitalWrite(redLed, LOW);
       Serial.println("the box is unlocked!");
+
+      numberOfKnocks = 0;
     }
   }
 }