diff --git a/daemon/container.go b/daemon/container.go
index 343a5e8f1c..e45ec68d52 100644
--- a/daemon/container.go
+++ b/daemon/container.go
@@ -686,10 +686,14 @@ func (container *Container) Mount() error {
 	return container.daemon.Mount(container)
 }
 
+func (container *Container) changes() ([]archive.Change, error) {
+	return container.daemon.Changes(container)
+}
+
 func (container *Container) Changes() ([]archive.Change, error) {
 	container.Lock()
 	defer container.Unlock()
-	return container.daemon.Changes(container)
+	return container.changes()
 }
 
 func (container *Container) GetImage() (*image.Image, error) {
@@ -750,7 +754,7 @@ func (container *Container) GetSize() (int64, int64) {
 	}
 	defer container.Unmount()
 
-	if differ, ok := container.daemon.driver.(graphdriver.Differ); ok {
+	if differ, ok := driver.(graphdriver.Differ); ok {
 		sizeRw, err = differ.DiffSize(container.ID)
 		if err != nil {
 			log.Errorf("Warning: driver %s couldn't return diff size of container %s: %s", driver, container.ID, err)
@@ -759,7 +763,7 @@ func (container *Container) GetSize() (int64, int64) {
 			sizeRw = -1
 		}
 	} else {
-		changes, _ := container.Changes()
+		changes, _ := container.changes()
 		if changes != nil {
 			sizeRw = archive.ChangesSize(container.basefs, changes)
 		} else {
diff --git a/integration-cli/docker_cli_ps_test.go b/integration-cli/docker_cli_ps_test.go
index 4ff3012194..631a27ce9e 100644
--- a/integration-cli/docker_cli_ps_test.go
+++ b/integration-cli/docker_cli_ps_test.go
@@ -4,6 +4,7 @@ import (
 	"os/exec"
 	"strings"
 	"testing"
+	"time"
 )
 
 func TestListContainers(t *testing.T) {
@@ -199,3 +200,39 @@ func assertContainerList(out string, expected []string) bool {
 
 	return true
 }
+
+func TestListContainersSize(t *testing.T) {
+	name := "test_size"
+	runCmd := exec.Command(dockerBinary, "run", "--name", name, "busybox", "sh", "-c", "echo 1 > test")
+	out, _, err := runCommandWithOutput(runCmd)
+	errorOut(err, t, out)
+	id, err := getIDByName(name)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	runCmd = exec.Command(dockerBinary, "ps", "-s", "-n=1")
+	wait := make(chan struct{})
+	go func() {
+		out, _, err = runCommandWithOutput(runCmd)
+		close(wait)
+	}()
+	select {
+	case <-wait:
+	case <-time.After(3 * time.Second):
+		t.Fatalf("Calling \"docker ps -s\" timed out!")
+	}
+	errorOut(err, t, out)
+	lines := strings.Split(strings.Trim(out, "\n "), "\n")
+	sizeIndex := strings.Index(lines[0], "SIZE")
+	idIndex := strings.Index(lines[0], "CONTAINER ID")
+	foundID := lines[1][idIndex : idIndex+12]
+	if foundID != id[:12] {
+		t.Fatalf("Expected id %s, got %s", id[:12], foundID)
+	}
+	expectedSize := "2 B"
+	foundSize := lines[1][sizeIndex:]
+	if foundSize != expectedSize {
+		t.Fatalf("Expected size %q, got %q", expectedSize, foundSize)
+	}
+}