diff --git a/frontend/dockerfile/cmd/dockerfile-frontend/main.go b/frontend/dockerfile/cmd/dockerfile-frontend/main.go
index 8e997566..c1a8b016 100644
--- a/frontend/dockerfile/cmd/dockerfile-frontend/main.go
+++ b/frontend/dockerfile/cmd/dockerfile-frontend/main.go
@@ -20,6 +20,8 @@ const (
 	defaultDockerfileName = "Dockerfile"
 	localNameDockerfile   = "dockerfile"
 	buildArgPrefix        = "build-arg:"
+	localNameContext      = "context"
+	gitPrefix             = "git://"
 )
 
 func main() {
@@ -51,6 +53,11 @@ func run() error {
 		llb.IncludePatterns([]string{filename}),
 		llb.SessionID(c.SessionID()),
 	)
+	var buildContext *llb.State
+	if strings.HasPrefix(opts[localNameContext], gitPrefix) {
+		src = parseGitSource(opts[localNameContext])
+		buildContext = &src
+	}
 	def, err := src.Marshal()
 	if err != nil {
 		return err
@@ -71,6 +78,7 @@ func run() error {
 		MetaResolver: c,
 		BuildArgs:    filterBuildArgs(opts),
 		SessionID:    c.SessionID(),
+		BuildContext: buildContext,
 	})
 
 	if err != nil {
@@ -105,3 +113,13 @@ func filterBuildArgs(opt map[string]string) map[string]string {
 	}
 	return m
 }
+
+func parseGitSource(ref string) llb.State {
+	ref = strings.TrimPrefix(ref, gitPrefix)
+	parts := strings.SplitN(ref, "#", 2)
+	branch := ""
+	if len(parts) > 1 {
+		branch = parts[1]
+	}
+	return llb.Git(parts[0], branch)
+}
diff --git a/frontend/dockerfile/dockerfile.go b/frontend/dockerfile/dockerfile.go
index fd68c5bf..30f0b2e6 100644
--- a/frontend/dockerfile/dockerfile.go
+++ b/frontend/dockerfile/dockerfile.go
@@ -24,6 +24,8 @@ const (
 	defaultDockerfileName = "Dockerfile"
 	localNameDockerfile   = "dockerfile"
 	buildArgPrefix        = "build-arg:"
+	localNameContext      = "context"
+	gitPrefix             = "git://"
 )
 
 func NewDockerfileFrontend() frontend.Frontend {
@@ -33,7 +35,6 @@ func NewDockerfileFrontend() frontend.Frontend {
 type dfFrontend struct{}
 
 func (f *dfFrontend) Solve(ctx context.Context, llbBridge frontend.FrontendLLBBridge, opts map[string]string) (retRef cache.ImmutableRef, exporterAttr map[string][]byte, retErr error) {
-
 	filename := opts[keyFilename]
 	if filename == "" {
 		filename = defaultDockerfileName
@@ -48,6 +49,13 @@ func (f *dfFrontend) Solve(ctx context.Context, llbBridge frontend.FrontendLLBBr
 		llb.IncludePatterns([]string{filename}),
 		llb.SessionID(sid),
 	)
+
+	var buildContext *llb.State
+	if strings.HasPrefix(opts[localNameContext], gitPrefix) {
+		src = parseGitSource(opts[localNameContext])
+		buildContext = &src
+	}
+
 	def, err := src.Marshal()
 	if err != nil {
 		return nil, nil, err
@@ -104,6 +112,7 @@ func (f *dfFrontend) Solve(ctx context.Context, llbBridge frontend.FrontendLLBBr
 		MetaResolver: llbBridge,
 		BuildArgs:    filterBuildArgs(opts),
 		SessionID:    sid,
+		BuildContext: buildContext,
 	})
 
 	if err != nil {
@@ -140,3 +149,13 @@ func filterBuildArgs(opt map[string]string) map[string]string {
 	}
 	return m
 }
+
+func parseGitSource(ref string) llb.State {
+	ref = strings.TrimPrefix(ref, gitPrefix)
+	parts := strings.SplitN(ref, "#", 2)
+	branch := ""
+	if len(parts) > 1 {
+		branch = parts[1]
+	}
+	return llb.Git(parts[0], branch)
+}
diff --git a/frontend/dockerfile/dockerfile2llb/convert.go b/frontend/dockerfile/dockerfile2llb/convert.go
index 38cdcb99..4bf13abc 100644
--- a/frontend/dockerfile/dockerfile2llb/convert.go
+++ b/frontend/dockerfile/dockerfile2llb/convert.go
@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"path"
+	"path/filepath"
 	"strconv"
 	"strings"
 
@@ -29,6 +30,7 @@ type ConvertOpt struct {
 	MetaResolver llb.ImageMetaResolver
 	BuildArgs    map[string]string
 	SessionID    string
+	BuildContext *llb.State
 }
 
 func Dockerfile2LLB(ctx context.Context, dt []byte, opt ConvertOpt) (*llb.State, *Image, error) {
@@ -124,6 +126,11 @@ func Dockerfile2LLB(ctx context.Context, dt []byte, opt ConvertOpt) (*llb.State,
 		return nil, nil, err
 	}
 
+	buildContext := llb.Local(localNameContext, llb.SessionID(opt.SessionID))
+	if opt.BuildContext != nil {
+		buildContext = *opt.BuildContext
+	}
+
 	for _, d := range allDispatchStates {
 		if d.base != nil {
 			d.state = d.base.state
@@ -159,6 +166,7 @@ func Dockerfile2LLB(ctx context.Context, dt []byte, opt ConvertOpt) (*llb.State,
 			buildArgValues:       opt.BuildArgs,
 			shlex:                shlex,
 			sessionID:            opt.SessionID,
+			buildContext:         buildContext,
 		}
 
 		if err = dispatchOnBuild(d, d.image.Config.OnBuild, opt); err != nil {
@@ -190,6 +198,7 @@ type dispatchOpt struct {
 	buildArgValues       map[string]string
 	shlex                *ShellLex
 	sessionID            string
+	buildContext         llb.State
 }
 
 func dispatch(d *dispatchState, cmd instructions.Command, opt dispatchOpt) error {
@@ -211,7 +220,7 @@ func dispatch(d *dispatchState, cmd instructions.Command, opt dispatchOpt) error
 	case *instructions.WorkdirCommand:
 		err = dispatchWorkdir(d, c)
 	case *instructions.AddCommand:
-		err = dispatchCopy(d, c.SourcesAndDest, llb.Local(localNameContext, llb.SessionID(opt.sessionID)))
+		err = dispatchCopy(d, c.SourcesAndDest, opt.buildContext)
 	case *instructions.LabelCommand:
 		err = dispatchLabel(d, c)
 	case *instructions.OnbuildCommand:
@@ -235,7 +244,7 @@ func dispatch(d *dispatchState, cmd instructions.Command, opt dispatchOpt) error
 	case *instructions.ArgCommand:
 		err = dispatchArg(d, c, opt.metaArgs, opt.buildArgValues)
 	case *instructions.CopyCommand:
-		l := llb.Local(localNameContext, llb.SessionID(opt.sessionID))
+		l := opt.buildContext
 		if c.From != "" {
 			index, err := strconv.Atoi(c.From)
 			if err != nil {