diff --git a/firmware/firmware.ino b/firmware/firmware.ino
index b293347..c9655e0 100644
--- a/firmware/firmware.ino
+++ b/firmware/firmware.ino
@@ -70,7 +70,7 @@ void setup()
 #ifndef SLEEP_IF_NO_WLAN_CONNECTION
   while
 #endif
-#if def SLEEP_IF_NO_WLAN_CONNECTION
+#ifdef def SLEEP_IF_NO_WLAN_CONNECTION
   if
 #endif
         (!wifiManager.autoConnect(wifiName.c_str(), "DEADBEEF"))