diff --git a/pyconfig.h.in b/pyconfig.h.in
index bdb242c..72fad87 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -371,6 +371,9 @@
 /* Define if you have the ftruncate function.  */
 #undef HAVE_FTRUNCATE
 
+/* Define if you have the gai_strerror function.  */
+#undef HAVE_GAI_STRERROR
+
 /* Define if you have the getaddrinfo function.  */
 #undef HAVE_GETADDRINFO