Fixes golang#34396

Change-Id: I35c4e3447f84e349adf7edba92ccb19b324bfe14
GitHub-Last-Rev: 4f06764
GitHub-Pull-Request: golang#60763
Reviewed-on: https://go-review.googlesource.com/c/go/+/502815
TryBot-Result: Gopher Robot gobot@golang.org
Reviewed-by: Dmitri Shuralyov dmitshur@google.com
Run-TryBot: Ian Lance Taylor iant@golang.org
Reviewed-by: Ian Lance Taylor iant@google.com
Run-TryBot: Ian Lance Taylor iant@google.com
Auto-Submit: Ian Lance Taylor iant@google.com

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