diff --git a/configure.ac b/configure.ac
index cbaf7561..9b480729 100644
--- a/configure.ac
+++ b/configure.ac
@@ -47,7 +47,7 @@ AC_DEFINE_UNQUOTED(PACKAGE_PIDFILE, LOCALSTATEDIR "/run/" PACKAGE ".pid", [The p
 AC_DEFINE_UNQUOTED(PACKAGE_LOGFILE, LOCALSTATEDIR "/log/" PACKAGE ".log", [The path and name of the log file.])
 AC_DEFINE_UNQUOTED(PACKAGE_CONFIGPATH, SYSCONFDIR "/" PACKAGE, [The default path of the configuration files.])
 
-AC_CHECK_PROGS([HAVE_DOXYGEN], [doxygen])
+AC_CHECK_PROGS([HAVE_DOXYGEN], [doxygen], [])
 if test -z "$HAVE_DOXYGEN";
 	then AC_MSG_WARN([Doxygen not found - continuing without Doxygen support.])
 fi