diff --git a/builder/amazon/chroot/step_mount_device.go b/builder/amazon/chroot/step_mount_device.go
index 0c68986da..70c186264 100644
--- a/builder/amazon/chroot/step_mount_device.go
+++ b/builder/amazon/chroot/step_mount_device.go
@@ -75,7 +75,7 @@ func (s *StepMountDevice) Cleanup(state map[string]interface{}) {
 	ui.Say("Unmounting the root device...")
 
 	unmountCommand := fmt.Sprintf("%s %s", config.UnmountCommand, s.mountPath)
-	cmd := exec.Command("bin/sh", "-c", unmountCommand)
+	cmd := exec.Command("/bin/sh", "-c", unmountCommand)
 	if err := cmd.Run(); err != nil {
 		ui.Error(fmt.Sprintf(
 			"Error unmounting root device: %s", err))
diff --git a/builder/amazon/chroot/step_mount_extra.go b/builder/amazon/chroot/step_mount_extra.go
index 8ce4d3794..be27708d1 100644
--- a/builder/amazon/chroot/step_mount_extra.go
+++ b/builder/amazon/chroot/step_mount_extra.go
@@ -69,7 +69,7 @@ func (s *StepMountExtra) Cleanup(state map[string]interface{}) {
 
 	for _, path := range s.mounts {
 		unmountCommand := fmt.Sprintf("%s %s", config.UnmountCommand, path)
-		cmd := exec.Command("bin/sh", "-c", unmountCommand)
+		cmd := exec.Command("/bin/sh", "-c", unmountCommand)
 		if err := cmd.Run(); err != nil {
 			ui.Error(fmt.Sprintf(
 				"Error unmounting root device: %s", err))