diff --git a/tasmota/tasmota_globals.h b/tasmota/tasmota_globals.h
index e245f3f2f..fa6a4f9fc 100644
--- a/tasmota/tasmota_globals.h
+++ b/tasmota/tasmota_globals.h
@@ -33,10 +33,10 @@ extern "C" {
 }
 #endif
 
-//#ifdef USE_KNX  // Enabling this will fail compilation. It has no impact if not used. (20180417)
-#include <esp-knx-ip.h>
+#include <esp-knx-ip.h> // KNX Header files have to be global else compile fails -> lib/headers
+#ifdef USE_KNX 
 void KNX_CB_Action(message_t const &msg, void *arg);
-//#endif  // USE_KNX
+#endif  // USE_KNX
 
 void DomoticzTempHumPressureSensor(float temp, float hum, float baro = -1);
 char* ToHex_P(const unsigned char * in, size_t insz, char * out, size_t outsz, char inbetween = '\0');