diff --git a/include/proto/session.h b/include/proto/session.h
index 0b7d08d99..f1e33fa0c 100644
--- a/include/proto/session.h
+++ b/include/proto/session.h
@@ -128,7 +128,8 @@ static inline int session_check_idle_conn(struct session *sess, struct connectio
 			/* The server doesn't want it, let's kill the connection right away */
 			conn->mux->destroy(conn);
 			return -1;
-		}
+		} else
+			conn->flags &= ~CO_FL_SESS_IDLE;
 		return 1;
 	} else {
 		conn->flags |= CO_FL_SESS_IDLE;
diff --git a/src/session.c b/src/session.c
index 9e95b328a..2732dbca8 100644
--- a/src/session.c
+++ b/src/session.c
@@ -87,6 +87,7 @@ void session_free(struct session *sess)
 				LIST_DEL(&conn->session_list);
 				LIST_INIT(&conn->session_list);
 				conn->owner = NULL;
+				conn->flags &= ~CO_FL_SESS_IDLE;
 				if (!srv_add_to_idle_list(objt_server(conn->target), conn))
 					conn->mux->destroy(conn);
 			} else {