diff --git a/src/cmd/linuxkit/moby/build.go b/src/cmd/linuxkit/moby/build.go
index 484aa89d3..93d83336c 100644
--- a/src/cmd/linuxkit/moby/build.go
+++ b/src/cmd/linuxkit/moby/build.go
@@ -51,10 +51,11 @@ var additions = map[string]addFun{
 	"docker": func(tw *tar.Writer) error {
 		log.Infof("  Adding Dockerfile")
 		hdr := &tar.Header{
-			Name:   "Dockerfile",
-			Mode:   0644,
-			Size:   int64(len(dockerfile)),
-			Format: tar.FormatPAX,
+			Name:    "Dockerfile",
+			Mode:    0644,
+			Size:    int64(len(dockerfile)),
+			ModTime: defaultModTime,
+			Format:  tar.FormatPAX,
 		}
 		if err := tw.WriteHeader(hdr); err != nil {
 			return err
@@ -368,6 +369,7 @@ func (k *kernelFilter) WriteHeader(hdr *tar.Header) error {
 				Name:     "boot",
 				Mode:     0755,
 				Typeflag: tar.TypeDir,
+				ModTime:  defaultModTime,
 				Format:   tar.FormatPAX,
 			}
 			if err := tw.WriteHeader(whdr); err != nil {
@@ -376,10 +378,11 @@ func (k *kernelFilter) WriteHeader(hdr *tar.Header) error {
 		}
 		// add the cmdline in /boot/cmdline
 		whdr := &tar.Header{
-			Name:   "boot/cmdline",
-			Mode:   0644,
-			Size:   int64(len(k.cmdline)),
-			Format: tar.FormatPAX,
+			Name:    "boot/cmdline",
+			Mode:    0644,
+			Size:    int64(len(k.cmdline)),
+			ModTime: defaultModTime,
+			Format:  tar.FormatPAX,
 		}
 		if err := tw.WriteHeader(whdr); err != nil {
 			return err
@@ -391,10 +394,11 @@ func (k *kernelFilter) WriteHeader(hdr *tar.Header) error {
 		}
 		// Stash the kernel header and prime the buffer for the kernel
 		k.hdr = &tar.Header{
-			Name:   "boot/kernel",
-			Mode:   hdr.Mode,
-			Size:   hdr.Size,
-			Format: tar.FormatPAX,
+			Name:    "boot/kernel",
+			Mode:    hdr.Mode,
+			Size:    hdr.Size,
+			ModTime: defaultModTime,
+			Format:  tar.FormatPAX,
 		}
 		k.buffer = new(bytes.Buffer)
 	case k.tar:
@@ -410,6 +414,7 @@ func (k *kernelFilter) WriteHeader(hdr *tar.Header) error {
 				Name:     "boot",
 				Mode:     0755,
 				Typeflag: tar.TypeDir,
+				ModTime:  defaultModTime,
 				Format:   tar.FormatPAX,
 			}
 			if err := tw.WriteHeader(whdr); err != nil {
@@ -417,10 +422,11 @@ func (k *kernelFilter) WriteHeader(hdr *tar.Header) error {
 			}
 		}
 		whdr := &tar.Header{
-			Name:   "boot/ucode.cpio",
-			Mode:   hdr.Mode,
-			Size:   hdr.Size,
-			Format: tar.FormatPAX,
+			Name:    "boot/ucode.cpio",
+			Mode:    hdr.Mode,
+			Size:    hdr.Size,
+			ModTime: defaultModTime,
+			Format:  tar.FormatPAX,
 		}
 		if err := tw.WriteHeader(whdr); err != nil {
 			return err
@@ -653,6 +659,7 @@ func filesystem(m Moby, tw *tar.Writer, idMap map[string]uint32) error {
 					Name:     root,
 					Typeflag: tar.TypeDir,
 					Mode:     dirMode,
+					ModTime:  defaultModTime,
 					Uid:      int(uid),
 					Gid:      int(gid),
 					Format:   tar.FormatPAX,
@@ -666,11 +673,12 @@ func filesystem(m Moby, tw *tar.Writer, idMap map[string]uint32) error {
 		}
 		addedFiles[f.Path] = true
 		hdr := &tar.Header{
-			Name:   f.Path,
-			Mode:   mode,
-			Uid:    int(uid),
-			Gid:    int(gid),
-			Format: tar.FormatPAX,
+			Name:    f.Path,
+			Mode:    mode,
+			ModTime: defaultModTime,
+			Uid:     int(uid),
+			Gid:     int(gid),
+			Format:  tar.FormatPAX,
 		}
 		if f.Directory {
 			if f.Contents != nil {
diff --git a/src/cmd/linuxkit/moby/image.go b/src/cmd/linuxkit/moby/image.go
index ef16416a1..7d7207278 100644
--- a/src/cmd/linuxkit/moby/image.go
+++ b/src/cmd/linuxkit/moby/image.go
@@ -71,6 +71,7 @@ func tarPrefix(path string, tw tarWriter) error {
 		hdr := &tar.Header{
 			Name:     mkdir,
 			Mode:     0755,
+			ModTime:  defaultModTime,
 			Typeflag: tar.TypeDir,
 			Format:   tar.FormatPAX,
 		}
@@ -154,6 +155,7 @@ func ImageTar(ref *reference.Spec, prefix string, tw tarWriter, trust bool, pull
 				contents := replace[hdr.Name]
 				hdr.Size = int64(len(contents))
 				hdr.Name = prefix + hdr.Name
+				hdr.ModTime = defaultModTime
 				log.Debugf("image tar: %s %s add %s", ref, prefix, hdr.Name)
 				if err := tw.WriteHeader(hdr); err != nil {
 					return err
@@ -169,6 +171,7 @@ func ImageTar(ref *reference.Spec, prefix string, tw tarWriter, trust bool, pull
 				hdr.Size = 0
 				hdr.Typeflag = tar.TypeSymlink
 				hdr.Linkname = resolv
+				hdr.ModTime = defaultModTime
 				log.Debugf("image tar: %s %s add resolv symlink /etc/resolv.conf -> %s", ref, prefix, resolv)
 				if err := tw.WriteHeader(hdr); err != nil {
 					return err
@@ -221,10 +224,11 @@ func ImageBundle(prefix string, ref *reference.Spec, config []byte, runtime Runt
 	}
 
 	hdr := &tar.Header{
-		Name:   path.Join(prefix, "config.json"),
-		Mode:   0644,
-		Size:   int64(len(config)),
-		Format: tar.FormatPAX,
+		Name:    path.Join(prefix, "config.json"),
+		Mode:    0644,
+		Size:    int64(len(config)),
+		ModTime: defaultModTime,
+		Format:  tar.FormatPAX,
 	}
 	if err := tw.WriteHeader(hdr); err != nil {
 		return err
@@ -242,6 +246,7 @@ func ImageBundle(prefix string, ref *reference.Spec, config []byte, runtime Runt
 			Name:     tmp,
 			Mode:     0755,
 			Typeflag: tar.TypeDir,
+			ModTime:  defaultModTime,
 			Format:   tar.FormatPAX,
 		}
 		if err := tw.WriteHeader(hdr); err != nil {
@@ -252,6 +257,7 @@ func ImageBundle(prefix string, ref *reference.Spec, config []byte, runtime Runt
 			Name:     path.Join(prefix, "rootfs"),
 			Mode:     0755,
 			Typeflag: tar.TypeDir,
+			ModTime:  defaultModTime,
 			Format:   tar.FormatPAX,
 		}
 		if err := tw.WriteHeader(hdr); err != nil {
@@ -271,6 +277,7 @@ func ImageBundle(prefix string, ref *reference.Spec, config []byte, runtime Runt
 				Name:     path.Join(prefix, "rootfs"),
 				Mode:     0755,
 				Typeflag: tar.TypeDir,
+				ModTime:  defaultModTime,
 				Format:   tar.FormatPAX,
 			}
 			if err := tw.WriteHeader(hdr); err != nil {
@@ -294,10 +301,11 @@ func ImageBundle(prefix string, ref *reference.Spec, config []byte, runtime Runt
 	}
 
 	hdr = &tar.Header{
-		Name:   path.Join(prefix, "runtime.json"),
-		Mode:   0644,
-		Size:   int64(len(runtimeConfig)),
-		Format: tar.FormatPAX,
+		Name:    path.Join(prefix, "runtime.json"),
+		Mode:    0644,
+		Size:    int64(len(runtimeConfig)),
+		ModTime: defaultModTime,
+		Format:  tar.FormatPAX,
 	}
 	if err := tw.WriteHeader(hdr); err != nil {
 		return err
diff --git a/src/cmd/linuxkit/moby/output.go b/src/cmd/linuxkit/moby/output.go
index 4b51e3ab1..dc8f90e01 100644
--- a/src/cmd/linuxkit/moby/output.go
+++ b/src/cmd/linuxkit/moby/output.go
@@ -281,10 +281,11 @@ func tarInitrdKernel(kernel, initrd []byte, cmdline string) (*bytes.Buffer, erro
 	buf := new(bytes.Buffer)
 	tw := tar.NewWriter(buf)
 	hdr := &tar.Header{
-		Name:   "kernel",
-		Mode:   0600,
-		Size:   int64(len(kernel)),
-		Format: tar.FormatPAX,
+		Name:    "kernel",
+		Mode:    0600,
+		Size:    int64(len(kernel)),
+		ModTime: defaultModTime,
+		Format:  tar.FormatPAX,
 	}
 	err := tw.WriteHeader(hdr)
 	if err != nil {
@@ -295,10 +296,11 @@ func tarInitrdKernel(kernel, initrd []byte, cmdline string) (*bytes.Buffer, erro
 		return buf, err
 	}
 	hdr = &tar.Header{
-		Name:   "initrd.img",
-		Mode:   0600,
-		Size:   int64(len(initrd)),
-		Format: tar.FormatPAX,
+		Name:    "initrd.img",
+		Mode:    0600,
+		Size:    int64(len(initrd)),
+		ModTime: defaultModTime,
+		Format:  tar.FormatPAX,
 	}
 	err = tw.WriteHeader(hdr)
 	if err != nil {
@@ -309,10 +311,11 @@ func tarInitrdKernel(kernel, initrd []byte, cmdline string) (*bytes.Buffer, erro
 		return buf, err
 	}
 	hdr = &tar.Header{
-		Name:   "cmdline",
-		Mode:   0600,
-		Size:   int64(len(cmdline)),
-		Format: tar.FormatPAX,
+		Name:    "cmdline",
+		Mode:    0600,
+		Size:    int64(len(cmdline)),
+		ModTime: defaultModTime,
+		Format:  tar.FormatPAX,
 	}
 	err = tw.WriteHeader(hdr)
 	if err != nil {
@@ -410,10 +413,11 @@ func outputKernelInitrdTarball(base string, kernel []byte, initrd []byte, cmdlin
 	tw := tar.NewWriter(f)
 	if len(kernel) != 0 {
 		hdr := &tar.Header{
-			Name:   "kernel",
-			Mode:   0644,
-			Size:   int64(len(kernel)),
-			Format: tar.FormatPAX,
+			Name:    "kernel",
+			Mode:    0644,
+			Size:    int64(len(kernel)),
+			ModTime: defaultModTime,
+			Format:  tar.FormatPAX,
 		}
 		if err := tw.WriteHeader(hdr); err != nil {
 			return err
@@ -424,10 +428,11 @@ func outputKernelInitrdTarball(base string, kernel []byte, initrd []byte, cmdlin
 	}
 	if len(initrd) != 0 {
 		hdr := &tar.Header{
-			Name:   "initrd.img",
-			Mode:   0644,
-			Size:   int64(len(initrd)),
-			Format: tar.FormatPAX,
+			Name:    "initrd.img",
+			Mode:    0644,
+			Size:    int64(len(initrd)),
+			ModTime: defaultModTime,
+			Format:  tar.FormatPAX,
 		}
 		if err := tw.WriteHeader(hdr); err != nil {
 			return err
@@ -438,10 +443,11 @@ func outputKernelInitrdTarball(base string, kernel []byte, initrd []byte, cmdlin
 	}
 	if len(cmdline) != 0 {
 		hdr := &tar.Header{
-			Name:   "cmdline",
-			Mode:   0644,
-			Size:   int64(len(cmdline)),
-			Format: tar.FormatPAX,
+			Name:    "cmdline",
+			Mode:    0644,
+			Size:    int64(len(cmdline)),
+			ModTime: defaultModTime,
+			Format:  tar.FormatPAX,
 		}
 		if err := tw.WriteHeader(hdr); err != nil {
 			return err
@@ -452,10 +458,11 @@ func outputKernelInitrdTarball(base string, kernel []byte, initrd []byte, cmdlin
 	}
 	if len(ucode) != 0 {
 		hdr := &tar.Header{
-			Name:   "ucode.cpio",
-			Mode:   0644,
-			Size:   int64(len(ucode)),
-			Format: tar.FormatPAX,
+			Name:    "ucode.cpio",
+			Mode:    0644,
+			Size:    int64(len(ucode)),
+			ModTime: defaultModTime,
+			Format:  tar.FormatPAX,
 		}
 		if err := tw.WriteHeader(hdr); err != nil {
 			return err
diff --git a/src/cmd/linuxkit/moby/util.go b/src/cmd/linuxkit/moby/util.go
index 56afefb88..8765f87f6 100644
--- a/src/cmd/linuxkit/moby/util.go
+++ b/src/cmd/linuxkit/moby/util.go
@@ -2,11 +2,14 @@ package moby
 
 import (
 	"path/filepath"
+	"time"
 )
 
 var (
 	// MobyDir is the location of the cache directory, defaults to ~/.moby
 	MobyDir string
+	// Default ModTime for files created during build. Roughly the time LinuxKit got open sourced.
+	defaultModTime = time.Date(2017, time.April, 18, 16, 30, 0, 0, time.UTC)
 )
 
 func defaultMobyConfigDir() string {