diff --git a/chapter10/c10.py b/chapter10/c10.py
index 1b1e022..2dc9ae7 100755
--- a/chapter10/c10.py
+++ b/chapter10/c10.py
@@ -98,7 +98,7 @@ def __next__(self):
                 self.file.seek(pos + 1)
 
     def __repr__(self):
-        return '<C10: {}>'.format(os.path.basename(self.file.name))
+        return '<C10: {}>'.format(os.path.basename(self.file.io.name))
 
     def __iter__(self):
         return self
diff --git a/tests/unit/test_c10.py b/tests/unit/test_c10.py
index e33db7a..c5ec397 100755
--- a/tests/unit/test_c10.py
+++ b/tests/unit/test_c10.py
@@ -15,3 +15,8 @@ def test_next():
 def test_next_stop():
     with pytest.raises(StopIteration):
         next(c10.C10(Mock(read=Mock(side_effect=EOFError))))
+
+def test_str_repr():
+    c = c10.C10(SAMPLE)
+    repr(c)
+    str(c)
\ No newline at end of file