diff --git a/doxygen/doxygen.conf b/doxygen/doxygen.conf
index 4b465074c..5112b6226 100644
--- a/doxygen/doxygen.conf
+++ b/doxygen/doxygen.conf
@@ -1907,7 +1907,7 @@ PERLMOD_MAKEVAR_PREFIX =
 # C-preprocessor directives found in the sources and include files.
 # The default value is: YES.
 
-ENABLE_PREPROCESSING   = YES
+ENABLE_PREPROCESSING   = NO
 
 # If the MACRO_EXPANSION tag is set to YES doxygen will expand all macro names
 # in the source code. If set to NO only conditional compilation will be