diff --git a/configure.in b/configure.in
index 6342f332a..37a453768 100644
--- a/configure.in
+++ b/configure.in
@@ -58,7 +58,7 @@ rk_TEST_PACKAGE(openldap,
 [-lldap -llber],,,OPENLDAP)
 
 AC_ARG_ENABLE(hdb-openldap-module, 
-	AC_HELP_STRING([--hdb-openldap-module],
+	AC_HELP_STRING([--enable-hdb-openldap-module],
 		[if you want support to build openldap hdb as shared object]))
 if test "$enable_hdb_openldap_module" = yes -a "$with_openldap" = yes; then
     AC_DEFINE(OPENLDAP_MODULE, 1, [Define if you want support for hdb ldap module])