diff --git a/src/connection.c b/src/connection.c
index c0ba815..67b2124 100644
--- a/src/connection.c
+++ b/src/connection.c
@@ -41,6 +41,8 @@
         .list = LIST_HEAD_INIT(mux_proto_list.list)
 };
 
+struct mux_stopping_data mux_stopping_data[MAX_THREADS];
+
 /* disables sending of proxy-protocol-v2's LOCAL command */
 static int pp2_never_send_local;