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-rw-r--r--ext/socket/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/socket/extconf.rb b/ext/socket/extconf.rb
index 6b03307f97..b9e66f676e 100644
--- a/ext/socket/extconf.rb
+++ b/ext/socket/extconf.rb
@@ -197,6 +197,7 @@ main()
for (passive = 0; passive <= 1; passive++) {
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
+ hints.ai_protocol = IPPROTO_TCP;
hints.ai_flags = passive ? AI_PASSIVE : 0;
hints.ai_socktype = SOCK_STREAM;
if ((gaierr = getaddrinfo(NULL, "54321", &hints, &aitop)) != 0) {