diff --git a/local/identifier.go b/local/identifier.go
new file mode 100644
index 00000000..dd24fba1
--- /dev/null
+++ b/local/identifier.go
@@ -0,0 +1,9 @@
+package local
+
+type IDIdentifier struct {
+	ImageID string
+}
+
+func (i IDIdentifier) String() string {
+	return i.ImageID
+}
diff --git a/local/local.go b/local/local.go
index 484bb757..7be67fb4 100644
--- a/local/local.go
+++ b/local/local.go
@@ -40,18 +40,10 @@ func (i *Image) Found() bool {
 
 func (i *Image) Identifier() (imgutil.Identifier, error) {
 	return IDIdentifier{
-		id: strings.TrimPrefix(i.lastIdentifier, "sha256:"),
+		ImageID: strings.TrimPrefix(i.lastIdentifier, "sha256:"),
 	}, nil
 }
 
-type IDIdentifier struct {
-	id string
-}
-
-func (i IDIdentifier) String() string {
-	return i.id
-}
-
 // GetLayer returns an io.ReadCloser with uncompressed layer data.
 // The layer will always have data, even if that means downloading ALL the image layers from the daemon.
 func (i *Image) GetLayer(diffID string) (io.ReadCloser, error) {