Fixes golang/go#27047

Change-Id: I0dd40201fc03e87fbc674b47bdf9315f1783d6c2
GitHub-Last-Rev: f28ab6234ade814c4bc09e26417c424c843ad57b
GitHub-Pull-Request: golang/go#27048
Reviewed-on: https://go-review.googlesource.com/c/129696Reviewed-by: komu wairagu <komuw05@gmail.com>
Reviewed-by: Andrew Bonventre <andybons@golang.org>