diff --git a/Doxyfile b/Doxyfile
index a03f5bfdb..8de8c573d 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -1386,7 +1386,7 @@ INCLUDE_FILE_PATTERNS  =
 # undefined via #undef or recursively expanded use the := operator
 # instead of the = operator.
 
-PREDEFINED             =
+PREDEFINED             = DOXYGEN_GENERATING_OUTPUT
 
 # 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.