@@ -4,8 +4,8 @@ import (

 	"context"

 	"encoding/json"

 	"net/url"

+	"path"

-	"github.com/containerd/containerd/platforms"

 	"github.com/docker/docker/api/types/container"

 	"github.com/docker/docker/api/types/network"

 	"github.com/docker/docker/api/types/versions"

@@ -37,8 +37,8 @@ func (cli *Client) ContainerCreate(ctx context.Context, config *container.Config

 	}

 	query := url.Values{}

-	if platform != nil {

-		query.Set("platform", platforms.Format(*platform))

+	if p := formatPlatform(platform); p != "" {

+		query.Set("platform", p)

 	}

 	if containerName != "" {

@@ -60,3 +60,15 @@ func (cli *Client) ContainerCreate(ctx context.Context, config *container.Config

 	err = json.NewDecoder(serverResp.body).Decode(&response)

 	return response, err

 }

+

+// formatPlatform returns a formatted string representing platform (e.g. linux/arm/v7).

+//

+// Similar to containerd's platforms.Format(), but does allow components to be

+// omitted (e.g. pass "architecture" only, without "os":

+// https://github.com/containerd/containerd/blob/v1.5.2/platforms/platforms.go#L243-L263

+func formatPlatform(platform *specs.Platform) string {

+	if platform == nil {

+		return ""

+	}

+	return path.Join(platform.OS, platform.Architecture, platform.Variant)

+}