diff --git a/pkg/volume/metrics_du_test.go b/pkg/volume/metrics_du_test.go
index c78dad1c7fd..72ba784e4ae 100644
--- a/pkg/volume/metrics_du_test.go
+++ b/pkg/volume/metrics_du_test.go
@@ -22,6 +22,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"syscall"
 	"testing"
 
 	utiltesting "k8s.io/client-go/util/testing"
@@ -29,7 +30,15 @@ import (
 	volumetest "k8s.io/kubernetes/pkg/volume/testing"
 )
 
-const expectedBlockSize = 4096
+func getExpectedBlockSize(path string) int64 {
+	statfs := &syscall.Statfs_t{}
+	err := syscall.Statfs(path, statfs)
+	if err != nil {
+		return 0
+	}
+
+	return int64(statfs.Bsize)
+}
 
 // TestMetricsDuGetCapacity tests that MetricsDu can read disk usage
 // for path
@@ -69,7 +78,7 @@ func TestMetricsDuGetCapacity(t *testing.T) {
 	if err != nil {
 		t.Errorf("Unexpected error when calling GetMetrics %v", err)
 	}
-	if e, a := (expectedEmptyDirUsage.Value() + expectedBlockSize), actual.Used.Value(); e != a {
+	if e, a := (expectedEmptyDirUsage.Value() + getExpectedBlockSize(filepath.Join(tmpDir, "f1"))), actual.Used.Value(); e != a {
 		t.Errorf("Unexpected Used for directory with file.  Expected %v, got %d.", e, a)
 	}
 }