diff --git a/aegisub/docs/doxygen/doxyfile b/aegisub/docs/doxygen/doxyfile
index 3c2f64eb5..72c86f664 100644
--- a/aegisub/docs/doxygen/doxyfile
+++ b/aegisub/docs/doxygen/doxyfile
@@ -210,12 +210,13 @@ PERLMOD_MAKEVAR_PREFIX =
 # Configuration options related to the preprocessor   
 #---------------------------------------------------------------------------
 ENABLE_PREPROCESSING   = YES
-MACRO_EXPANSION        = NO
-EXPAND_ONLY_PREDEF     = NO
+MACRO_EXPANSION        = YES
+EXPAND_ONLY_PREDEF     = YES
 SEARCH_INCLUDES        = YES
 INCLUDE_PATH           = 
 INCLUDE_FILE_PATTERNS  = 
 PREDEFINED             = 
+PREDEFINED             += WXUNUSED(x)= 
 EXPAND_AS_DEFINED      = 
 SKIP_FUNCTION_MACROS   = YES
 #---------------------------------------------------------------------------