diff --git a/configure.ac b/configure.ac
index 77f76e122..d6f814b26 100644
--- a/configure.ac
+++ b/configure.ac
@@ -94,11 +94,6 @@ AC_ARG_WITH(docbook-catalog, AC_HELP_STRING([--with-docbook-catalog=PATH],
   docbookcatalog=$withval, docbookcatalog=/docbook-dtd-missing)
 AC_SUBST(docbookcatalog)
 
-AC_ARG_WITH(docbook-ebnf-catalog, AC_HELP_STRING([--with-docbook-ebnf-catalog=PATH],
-  [path of the DocBook XML EBNF module DTD]),
-  docbookebnfcatalog=$withval, docbookcatalog=/docbook-ebnf-dtd-missing)
-AC_SUBST(docbookebnfcatalog)
-
 AC_ARG_WITH(docbook-xsl, AC_HELP_STRING([--with-docbook-xsl=PATH],
   [path of the DocBook XSL stylesheets]),
   docbookxsl=$withval, docbookxsl=/docbook-xsl-missing)