diff --git a/buildfile.go b/buildfile.go
index a91d779ff5..6ed0276bec 100644
--- a/buildfile.go
+++ b/buildfile.go
@@ -164,10 +164,6 @@ func (b *buildFile) CmdCopy(args string) error {
 	return fmt.Errorf("COPY has been deprecated. Please use ADD instead")
 }
 
-func (b *buildFile) isUrl(str string) bool {
-	return strings.HasPrefix(str, "http://") || strings.HasPrefix(str, "https://")
-}
-
 func (b *buildFile) addRemote(container *Container, orig, dest string) error {
 	file, err := utils.Download(orig, ioutil.Discard)
 	if err != nil {
@@ -238,7 +234,7 @@ func (b *buildFile) CmdAdd(args string) error {
 	}
 	defer container.Unmount()
 
-	if b.isUrl(orig) {
+	if utils.IsURL(orig) {
 		if err := b.addRemote(container, orig, dest); err != nil {
 			return err
 		}
diff --git a/utils/utils.go b/utils/utils.go
index c3f9e571d3..752cc03f32 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -70,7 +70,7 @@ type progressReader struct {
 	readProgress int           // How much has been read so far (bytes)
 	lastUpdate   int           // How many bytes read at least update
 	template     string        // Template to print. Default "%v/%v (%v)"
-	sf *StreamFormatter
+	sf           *StreamFormatter
 }
 
 func (r *progressReader) Read(p []byte) (n int, err error) {
@@ -103,7 +103,7 @@ func (r *progressReader) Close() error {
 	return io.ReadCloser(r.reader).Close()
 }
 func ProgressReader(r io.ReadCloser, size int, output io.Writer, template []byte, sf *StreamFormatter) *progressReader {
-      	tpl := string(template)
+	tpl := string(template)
 	if tpl == "" {
 		tpl = string(sf.FormatProgress("", "%v/%v (%v)"))
 	}
@@ -585,7 +585,7 @@ func (sf *StreamFormatter) FormatStatus(format string, a ...interface{}) []byte
 	sf.used = true
 	str := fmt.Sprintf(format, a...)
 	if sf.json {
-		b, err := json.Marshal(&JSONMessage{Status:str});
+		b, err := json.Marshal(&JSONMessage{Status: str})
 		if err != nil {
 			return sf.FormatError(err)
 		}
@@ -597,7 +597,7 @@ func (sf *StreamFormatter) FormatStatus(format string, a ...interface{}) []byte
 func (sf *StreamFormatter) FormatError(err error) []byte {
 	sf.used = true
 	if sf.json {
-		if b, err := json.Marshal(&JSONMessage{Error:err.Error()}); err == nil {
+		if b, err := json.Marshal(&JSONMessage{Error: err.Error()}); err == nil {
 			return b
 		}
 		return []byte("{\"error\":\"format error\"}")
@@ -608,10 +608,10 @@ func (sf *StreamFormatter) FormatError(err error) []byte {
 func (sf *StreamFormatter) FormatProgress(action, str string) []byte {
 	sf.used = true
 	if sf.json {
-		b, err := json.Marshal(&JSONMessage{Status: action, Progress:str})
+		b, err := json.Marshal(&JSONMessage{Status: action, Progress: str})
 		if err != nil {
-                        return nil
-                }
+			return nil
+		}
 		return b
 	}
 	return []byte(action + " " + str + "\r")
@@ -620,3 +620,7 @@ func (sf *StreamFormatter) FormatProgress(action, str string) []byte {
 func (sf *StreamFormatter) Used() bool {
 	return sf.used
 }
+
+func IsURL(str string) bool {
+	return strings.HasPrefix(str, "http://") || strings.HasPrefix(str, "https://")
+}