diff --git a/src/app/app.ino b/src/app/app.ino
index cfa86d7..af7094b 100644
--- a/src/app/app.ino
+++ b/src/app/app.ino
@@ -55,7 +55,7 @@ void setup() {
   Serial.begin(115200, SERIAL_8N1, SERIAL_TX_ONLY);
   //We set the RXD0 as a GPIO
   pinMode(D9, FUNCTION_3);
-  pinMode(D9, INPUT);
+  pinMode(D9, INPUT_PULLUP);
   attachInterruptArg(D9,&(NRFIRQsHandler), (void *)&IRQFlag, FALLING);
   //We set the WiFi part up :
   gotIp = WiFi.onStationModeGotIP(&(gotIpFunc));