diff --git a/doxygen/mbedtls.doxyfile b/doxygen/mbedtls.doxyfile
index d19c231..0a26dcb 100644
--- a/doxygen/mbedtls.doxyfile
+++ b/doxygen/mbedtls.doxyfile
@@ -1624,7 +1624,8 @@
                          ENABLE_PLUGIN \
                          ENABLE_MANAGEMENT \
                          ENABLE_OCC \
-                         HAVE_GETTIMEOFDAY
+                         HAVE_GETTIMEOFDAY \
+                         DOXYGEN_ONLY
 
 # 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.