@@ -191,7 +191,7 @@ func (p *puller) resolver(g session.Group) remotes.Resolver {

 	return resolver.DefaultPool.GetResolver(p.is.RegistryHosts, p.src.Reference.String(), "pull", p.sm, g)

 }

-func (p *puller) mainManifestKey(dgst digest.Digest, platform ocispec.Platform) (digest.Digest, error) {

+func (p *puller) mainManifestKey(platform ocispec.Platform) (digest.Digest, error) {

 	dt, err := json.Marshal(struct {

 		Digest  digest.Digest

 		OS      string

@@ -301,7 +301,7 @@ func (p *puller) CacheKey(ctx context.Context, g session.Group, index int) (stri

 	p.resolveLocal()

 	if p.desc.Digest != "" && index == 0 {

-		dgst, err := p.mainManifestKey(p.desc.Digest, p.platform)

+		dgst, err := p.mainManifestKey(p.platform)

 		if err != nil {

 			return "", nil, false, err

 		}

@@ -321,7 +321,7 @@ func (p *puller) CacheKey(ctx context.Context, g session.Group, index int) (stri

 	}

 	if p.desc.Digest != "" && index == 0 {

-		dgst, err := p.mainManifestKey(p.desc.Digest, p.platform)

+		dgst, err := p.mainManifestKey(p.platform)

 		if err != nil {

 			return "", nil, false, err

 		}

@@ -330,7 +330,7 @@ func (p *puller) CacheKey(ctx context.Context, g session.Group, index int) (stri

 	k := cacheKeyFromConfig(p.config).String()

 	if k == "" {

-		dgst, err := p.mainManifestKey(p.desc.Digest, p.platform)

+		dgst, err := p.mainManifestKey(p.platform)

 		if err != nil {

 			return "", nil, false, err

 		}