diff --git a/builder/dockerfile/builder.go b/builder/dockerfile/builder.go
index c7784e2a9f..d8f48ae2c0 100644
--- a/builder/dockerfile/builder.go
+++ b/builder/dockerfile/builder.go
@@ -85,10 +85,6 @@ func (bm *BuildManager) Build(ctx context.Context, config backend.BuildConfig) (
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
-	if config.Options.SessionID != "" {
-		return nil, errors.New("experimental session with v1 builder is no longer supported, use builder version v2 (BuildKit) instead")
-	}
-
 	builderOptions := builderOptions{
 		Options:        config.Options,
 		ProgressWriter: config.ProgressWriter,
diff --git a/builder/remotecontext/detect.go b/builder/remotecontext/detect.go
index a1953dd924..251fd08931 100644
--- a/builder/remotecontext/detect.go
+++ b/builder/remotecontext/detect.go
@@ -33,12 +33,7 @@ func Detect(config backend.BuildConfig) (remote builder.Source, dockerfile *pars
 	case remoteURL == "":
 		remote, dockerfile, err = newArchiveRemote(config.Source, dockerfilePath)
 	case remoteURL == ClientSessionRemote:
-		res, err := parser.Parse(config.Source)
-		if err != nil {
-			return nil, nil, errdefs.InvalidParameter(err)
-		}
-
-		return nil, res, nil
+		return nil, nil, errdefs.InvalidParameter(errors.New("experimental session with v1 builder is no longer supported, use builder version v2 (BuildKit) instead"))
 	case urlutil.IsGitURL(remoteURL):
 		remote, dockerfile, err = newGitRemote(remoteURL, dockerfilePath)
 	case urlutil.IsURL(remoteURL):