diff --git a/ampel-firmware/ampel-firmware.ino b/ampel-firmware/ampel-firmware.ino
index c5e82c868a13ce2eca3fd5365e9364c903a50d52..e4dacdbfbe7a7a6c8a10f19b86c8d81940754c40 100644
--- a/ampel-firmware/ampel-firmware.ino
+++ b/ampel-firmware/ampel-firmware.ino
@@ -55,6 +55,18 @@
  * and define your credentials and parameters in 'config.h'.
  */
 
+
+/*****************************************************************
+ * PreInit                                                         *
+ *****************************************************************/
+void preinit() {
+#ifndef AMPEL_WIFI
+  // Disable wifi as default
+  ESP8266WiFiClass::preinitWiFiOff();
+#endif
+}
+
+
 /*****************************************************************
  * Setup                                                         *
  *****************************************************************/