diff --git a/cpp/docs/api/Doxyfile b/cpp/docs/api/Doxyfile
index 6fc07e2d..29e9a282 100644
--- a/cpp/docs/api/Doxyfile
+++ b/cpp/docs/api/Doxyfile
@@ -2060,7 +2060,7 @@ MACRO_EXPANSION        = YES
 # The default value is: NO.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-EXPAND_ONLY_PREDEF     = YES
+EXPAND_ONLY_PREDEF     = NO
 
 # If the SEARCH_INCLUDES tag is set to YES, the include files in the
 # INCLUDE_PATH will be searched if a #include is found.