diff --git a/doc/sphinx/doxygen.ini.in b/doc/sphinx/doxygen.ini.in
index 52524aab..c80d6fe4 100644
--- a/doc/sphinx/doxygen.ini.in
+++ b/doc/sphinx/doxygen.ini.in
@@ -1721,15 +1721,6 @@ GENERATE_DOCBOOK       = NO
 
 DOCBOOK_OUTPUT         = docbook
 
-# If the DOCBOOK_PROGRAMLISTING tag is set to YES, doxygen will include the
-# program listings (including syntax highlighting and cross-referencing
-# information) to the DOCBOOK output. Note that enabling this will significantly
-# increase the size of the DOCBOOK output.
-# The default value is: NO.
-# This tag requires that the tag GENERATE_DOCBOOK is set to YES.
-
-DOCBOOK_PROGRAMLISTING = NO
-
 #---------------------------------------------------------------------------
 # Configuration options for the AutoGen Definitions output
 #---------------------------------------------------------------------------