diff --git a/pyconfig.h.in b/pyconfig.h.in
index 3df44d4..eb25449 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -533,6 +533,9 @@
 /* Define if you have readline 4.2 */
 #undef HAVE_RL_COMPLETION_MATCHES
 
+/* Define if you have rl_completion_suppress_append */
+#undef HAVE_RL_COMPLETION_SUPPRESS_APPEND
+
 /* Define if you have readline 4.0 */
 #undef HAVE_RL_PRE_INPUT_HOOK