diff --git a/include/patty/ax25.h b/include/patty/ax25.h
index 684709f..bea2060 100644
--- a/include/patty/ax25.h
+++ b/include/patty/ax25.h
@@ -38,9 +38,14 @@ enum patty_ax25_sock_mode {
     PATTY_AX25_SOCK_SABME
 };
 
+enum patty_ax25_sock_opts {
+    PATTY_AX25_SOCK_NONBLOCK = 1 << 0
+};
+
 typedef struct _patty_ax25_sock {
     enum patty_ax25_sock_status status;
     enum patty_ax25_sock_mode   mode;
+    enum patty_ax25_sock_opts   opts;
 
     time_t timer_ack;
     time_t timer_response;