diff --git a/include/haproxy/session-t.h b/include/haproxy/session-t.h
index 3bb753a..45b820c 100644
--- a/include/haproxy/session-t.h
+++ b/include/haproxy/session-t.h
@@ -54,9 +54,10 @@
 	struct vars vars;               /* list of variables for the session scope. */
 	struct task *task;              /* handshake timeout processing */
 	long t_handshake;               /* handshake duration, -1 = not completed */
+	long t_idle;                    /* idle duration, -1 if never occurs */
 	int idle_conns;                 /* Number of connections we're currently responsible for that we are not using */
-	struct list srv_list;           /* List of servers and the connections the session is currently responsible for */
 	unsigned int flags;             /* session flags, SESS_FL_* */
+	struct list srv_list;           /* List of servers and the connections the session is currently responsible for */
 };
 
 struct sess_srv_list {
diff --git a/src/session.c b/src/session.c
index 710b6b6..07828df 100644
--- a/src/session.c
+++ b/src/session.c
@@ -50,6 +50,7 @@
 		vars_init(&sess->vars, SCOPE_SESS);
 		sess->task = NULL;
 		sess->t_handshake = -1; /* handshake not done yet */
+		sess->t_idle = -1;
 		_HA_ATOMIC_ADD(&totalconn, 1);
 		_HA_ATOMIC_ADD(&jobs, 1);
 		LIST_INIT(&sess->srv_list);