diff --git a/chunk/in_memory_test.go b/chunk/in_memory_test.go
index 7970d14..b9711ca 100644
--- a/chunk/in_memory_test.go
+++ b/chunk/in_memory_test.go
@@ -6,19 +6,19 @@
 )
 
 func TestConcurrentReads(t *testing.T) {
-	c := InMemoryChunkFactory{}.New()
-	if _, err := c.Writer().Write([]byte("abcd")); err != nil {
+	c := InMemoryChunkFactory{}.New(4)
+	if _, err := c.WriterAt().WriteAt([]byte("abcd"), 0); err != nil {
 		panic(err)
 	}
 	d1 := make([]byte, 2)
 	d2 := make([]byte, 3)
-	if _, err := c.ReadSeeker().Read(d1); err != nil {
+	if _, err := c.ReaderAt().ReadAt(d1, 0); err != nil {
 		t.Error(err)
 	}
 	if bytes.Compare(d1, []byte("ab")) != 0 {
 		t.Errorf("Expected: %s\nActual: %s", "ab", d1)
 	}
-	if _, err := c.ReadSeeker().Read(d2); err != nil {
+	if _, err := c.ReaderAt().ReadAt(d2, 0); err != nil {
 		t.Error(err)
 	}
 	if bytes.Compare(d2, []byte("abc")) != 0 {