mongostat doesn't work with --uri with replica set name

$ mongostat --uri=mongodb://urania:61368,urania:61378,urania:61387/?replicaSet=foo

2019-10-11T11:26:15.540-0400    could not connect to server: server selection error: server selection timeout

current topology: Type: Single

Servers:

$ mongostat --uri=mongodb://urania:61368,urania:61378,urania:61387

insert query update delete getmore command dirty used flushes vsize   res qrw arw net_in net_out conn                time

    *0    *0     *0     *0       0     1|0  0.0% 0.4%       0 5.35G 55.0M 0|0 1|0   169b   33.5k    2 Oct 11 11:25:15.245

    *0    *0     *0     *0       0     0|0  0.0% 0.4%       0 5.35G 55.0M 0|0 1|0   111b   33.3k    2 Oct 11 11:25:16.245

    *0    *0     *0     *0       0     0|0  0.0% 0.4%       0 5.35G 55.0M 0|0 1|0   111b   33.3k    2 Oct 11 11:25:17.247

    *0    *0     *0     *0       0     0|0  0.0% 0.4%       0 5.35G 55.0M 0|0 1|0   111b   33.3k    2 Oct 11 11:25:18.247