diff --git a/doxygen/mbedtls.doxyfile b/doxygen/mbedtls.doxyfile
index 57bc5182b..5aa970b80 100644
--- a/doxygen/mbedtls.doxyfile
+++ b/doxygen/mbedtls.doxyfile
@@ -1485,13 +1485,13 @@ XML_OUTPUT             = xml
 # which can be used by a validating XML parser to check the
 # syntax of the XML files.
 
-XML_SCHEMA             =
+#XML_SCHEMA             =
 
 # The XML_DTD tag can be used to specify an XML DTD,
 # which can be used by a validating XML parser to check the
 # syntax of the XML files.
 
-XML_DTD                =
+#XML_DTD                =
 
 # If the XML_PROGRAMLISTING tag is set to YES Doxygen will
 # dump the program listings (including syntax highlighting