diff --git a/module_usb_audio/devicedefines.h b/module_usb_audio/devicedefines.h
index f07f4ad9..9a4a8c31 100644
--- a/module_usb_audio/devicedefines.h
+++ b/module_usb_audio/devicedefines.h
@@ -8,6 +8,10 @@
 
 #include "customdefines.h"
 
+#ifdef __iap_conf_h_exists__
+#include "iap_conf.h"
+#endif
+
 /* Tidy up historical INPUT/OUTPUT defines. INPUT/OUTPUT now enabled based on channel count defines */
 #if !defined(NUM_USB_CHAN_IN)
     #error NUM_USB_CHAN_IN must be defined!