diff --git a/Doxyfile b/Doxyfile
index 9bffde85..a05f4d26 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -2169,7 +2169,8 @@ INCLUDE_FILE_PATTERNS  =
 # recursively expanded use the := operator instead of the = operator.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-PREDEFINED             = SR_API=
+PREDEFINED             = SR_API= \
+                         HAVE_SERIAL_COMM
 
 # 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. The