diff --git a/interface.go b/interface.go
index 49b66b1d17..d0834afa94 100644
--- a/interface.go
+++ b/interface.go
@@ -119,6 +119,7 @@ type ServiceAPIClient interface {
 type SwarmAPIClient interface {
 	SwarmInit(ctx context.Context, req swarm.InitRequest) (string, error)
 	SwarmJoin(ctx context.Context, req swarm.JoinRequest) error
+	SwarmUnlock(ctx context.Context, req swarm.UnlockRequest) error
 	SwarmLeave(ctx context.Context, force bool) error
 	SwarmInspect(ctx context.Context) (swarm.Swarm, error)
 	SwarmUpdate(ctx context.Context, version swarm.Version, swarm swarm.Spec, flags swarm.UpdateFlags) error
diff --git a/swarm_unlock.go b/swarm_unlock.go
new file mode 100644
index 0000000000..addfb59f0a
--- /dev/null
+++ b/swarm_unlock.go
@@ -0,0 +1,17 @@
+package client
+
+import (
+	"github.com/docker/docker/api/types/swarm"
+	"golang.org/x/net/context"
+)
+
+// SwarmUnlock unlockes locked swarm.
+func (cli *Client) SwarmUnlock(ctx context.Context, req swarm.UnlockRequest) error {
+	serverResp, err := cli.post(ctx, "/swarm/unlock", nil, req, nil)
+	if err != nil {
+		return err
+	}
+
+	ensureReaderClosed(serverResp)
+	return err
+}