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-rw-r--r--pkg/varlinkapi/attach.go5
1 files changed, 4 insertions, 1 deletions
diff --git a/pkg/varlinkapi/attach.go b/pkg/varlinkapi/attach.go
index 2234899a5..8051f07be 100644
--- a/pkg/varlinkapi/attach.go
+++ b/pkg/varlinkapi/attach.go
@@ -60,7 +60,10 @@ func (i *LibpodAPI) Attach(call iopodman.VarlinkCall, name string, detachKeys st
if !start && state != libpod.ContainerStateRunning {
return call.ReplyErrorOccurred("container must be running to attach")
}
- call.Reply(nil)
+
+ // ACK the client upgrade request
+ call.ReplyAttach()
+
reader, writer, _, pw, streams := setupStreams(call)
go func() {