diff --git a/module_usb_audio/devicedefines.h b/module_usb_audio/devicedefines.h
index f845c2a8..c9196291 100644
--- a/module_usb_audio/devicedefines.h
+++ b/module_usb_audio/devicedefines.h
@@ -165,7 +165,9 @@
 #endif
 
 /* The number of clock ticks to wait for the audio PLL to lock */
+#ifndef AUDIO_PLL_LOCK_DELAY
 #define AUDIO_PLL_LOCK_DELAY     (40000000) 
+#endif
 
 /* Vendor/Product strings */
 #ifndef VENDOR_STR