diff --git a/cmd/moby/linuxkit.go b/cmd/moby/linuxkit.go
index ac5be8780..5d14e5855 100644
--- a/cmd/moby/linuxkit.go
+++ b/cmd/moby/linuxkit.go
@@ -22,7 +22,7 @@ init:
   - linuxkit/containerd:b1766e4c4c09f63ac4925a6e4612852a93f7e73b
 onboot:
   - name: mkimage
-    image: "linuxkit/mkimage:f4bf0c24261f7d120c8674892805ab3054eb8ac3"
+    image: "linuxkit/mkimage:5ad60299be03008f29c5caec3c5ea4ac0387aae6"
   - name: poweroff
     image: "linuxkit/poweroff:a8f1e4ad8d459f1fdaad9e4b007512cb3b504ae8"
 trust:
diff --git a/cmd/moby/output.go b/cmd/moby/output.go
index 9979a812b..6d7843e50 100644
--- a/cmd/moby/output.go
+++ b/cmd/moby/output.go
@@ -17,6 +17,7 @@ import (
 const (
 	bios = "linuxkit/mkimage-iso-bios:db791abed6f2b5320feb6cec255a635aee3756f6@sha256:e57483075307bcea4a7257f87eee733d3e24e7a964ba15dcc01111df6729ab3b"
 	efi  = "linuxkit/mkimage-iso-efi:5c2fc616bde288476a14f4f6dd0d273a66832822@sha256:876ef47ec2b30af40e70f1e98f496206eb430915867c4f9f400e1af47fd58d7c"
+	gcp  = "linuxkit/mkimage-gcp:46716b3d3f7aa1a7607a3426fe0ccebc554b14ee@sha256:18d8e0482f65a2481f5b6ba1e7ce77723b246bf13bdb612be5e64df90297940c"
 	vhd  = "linuxkit/mkimage-vhd:a04c8480d41ca9cef6b7710bd45a592220c3acb2@sha256:ba373dc8ae5dc72685dbe4b872d8f588bc68b2114abd8bdc6a74d82a2b62cce3"
 	vmdk = "linuxkit/mkimage-vmdk:182b541474ca7965c8e8f987389b651859f760da@sha256:99638c5ddb17614f54c6b8e11bd9d49d1dea9d837f38e0f6c1a5f451085d449b"
 )
@@ -116,61 +117,14 @@ var outFuns = map[string]func(string, []byte, int, bool) error{
 		return nil
 	},
 	"gcp-img": func(base string, image []byte, size int, hyperkit bool) error {
-		filename := base + ".img.tar.gz"
-		log.Infof("  %s", filename)
 		kernel, initrd, cmdline, err := tarToInitrd(image)
 		if err != nil {
 			return fmt.Errorf("Error converting to initrd: %v", err)
 		}
-		tmp, err := ioutil.TempDir(filepath.Join(MobyDir, "tmp"), "gcp-img")
-		if err != nil {
-			return err
-		}
-		defer os.RemoveAll(tmp)
-		err = outputLinuxKit("raw", filepath.Join(tmp, "disk.raw"), kernel, initrd, cmdline, size, hyperkit)
+		err = outputImg(gcp, base+".img.tar.gz", kernel, initrd, cmdline)
 		if err != nil {
 			return fmt.Errorf("Error writing gcp-img output: %v", err)
 		}
-		out, err := os.Create(filename)
-		if err != nil {
-			return err
-		}
-		in, err := os.Open(filepath.Join(tmp, "disk.raw"))
-		if err != nil {
-			return err
-		}
-		fi, err := in.Stat()
-		if err != nil {
-			return err
-		}
-		zw := gzip.NewWriter(out)
-		tw := tar.NewWriter(zw)
-		hdr := &tar.Header{
-			Name: "disk.raw",
-			Mode: 0600,
-			Size: fi.Size(),
-		}
-		err = tw.WriteHeader(hdr)
-		if err != nil {
-			return err
-		}
-		io.Copy(tw, in)
-		err = tw.Close()
-		if err != nil {
-			return err
-		}
-		err = zw.Close()
-		if err != nil {
-			return err
-		}
-		err = in.Close()
-		if err != nil {
-			return err
-		}
-		err = out.Close()
-		if err != nil {
-			return err
-		}
 		return nil
 	},
 	"qcow2": func(base string, image []byte, size int, hyperkit bool) error {