diff --git a/libraries/ESP32/examples/Timer/RepeatTimer/RepeatTimer.ino b/libraries/ESP32/examples/Timer/RepeatTimer/RepeatTimer.ino
index 18fdc8035a5..e4ef7bc865b 100644
--- a/libraries/ESP32/examples/Timer/RepeatTimer/RepeatTimer.ino
+++ b/libraries/ESP32/examples/Timer/RepeatTimer/RepeatTimer.ino
@@ -33,7 +33,7 @@ void setup() {
   Serial.begin(115200);
 
   // Set BTN_STOP_ALARM to input mode
-  pinMode(BTN_STOP_ALARM, INPUT);
+  pinMode(BTN_STOP_ALARM, INPUT_PULLUP);
 
   // Create semaphore to inform us when the timer has fired
   timerSemaphore = xSemaphoreCreateBinary();