diff --git a/Doxyfile b/Doxyfile
index 2b0a8c78..5c8b9da3 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -1651,7 +1651,8 @@ INCLUDE_FILE_PATTERNS  =
 PREDEFINED             = WIICAMERA \
                          ARDUINO=100 \
                          __attribute__(x)= \
-                         PROGMEM
+                         PROGMEM \
+                         _usb_h_
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then 
 # this tag can be used to specify a list of macro names that should be expanded.