diff --git a/sources/usb_mem.c b/sources/usb_mem.c
index a9f40fc..fb771d0 100644
--- a/sources/usb_mem.c
+++ b/sources/usb_mem.c
@@ -29,7 +29,7 @@
 #define TRUE 1
 #endif
 
-#define USB_MEM_DEBUG
+#undef USB_MEM_DEBUG
 
 #ifdef	USB_MEM_DEBUG
 #define	USB_MEM_PRINTF(fmt, args...)	xprintf(fmt, ##args)