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-rw-r--r--ext/socket/rubysocket.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/socket/rubysocket.h b/ext/socket/rubysocket.h
index 68f2734241..8144872007 100644
--- a/ext/socket/rubysocket.h
+++ b/ext/socket/rubysocket.h
@@ -328,7 +328,7 @@ ssize_t rsock_recvmsg(int socket, struct msghdr *message, int flags);
#define rsock_bsock_recvmsg_nonblock rb_f_notimplement
#endif
-#ifdef HAVE_ST_MSG_CONTROL
+#ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
void rsock_discard_cmsg_resource(struct msghdr *mh, int msg_peek_p);
#endif