diff --git a/guile-readline/configure.in b/guile-readline/configure.in
index ad817ad91..9fe1f4818 100644
--- a/guile-readline/configure.in
+++ b/guile-readline/configure.in
@@ -34,8 +34,8 @@ fi
 
 if test $ac_cv_lib_readline_main = yes \
         -a $ac_cv_var_rl_getc_function = no; then
-  AC_MSG_WARN([Warning: libreadline is too old on your system.  You need])
-  AC_MSG_WARN([readline version 2.1 or later.])
+  AC_MSG_WARN([*** libreadline is too old on your system.])
+  AC_MSG_WARN([*** You need readline version 2.1 or later.])
 fi
 
 AC_CHECK_FUNCS(strdup)