diff --git a/src/class/dfu/dfu_device.c b/src/class/dfu/dfu_device.c
index a7a8f578c..51e6179bc 100644
--- a/src/class/dfu/dfu_device.c
+++ b/src/class/dfu/dfu_device.c
@@ -37,8 +37,6 @@
 // MACRO CONSTANT TYPEDEF
 //--------------------------------------------------------------------+
 
-#define DFU_INTF_UNUSED 0xFF
-
 //--------------------------------------------------------------------+
 // INTERNAL OBJECT & FUNCTION DECLARATION
 //--------------------------------------------------------------------+