diff --git a/README.md b/README.md
index 2d10a86..9685172 100644
--- a/README.md
+++ b/README.md
@@ -518,6 +518,8 @@ More details can be found in [CONTRIBUTING](CONTRIBUTING.md).
 * generalized star expression handling, including double stars; this
   fixes multiplication making expressions "unsafe" for trailing commas (#132)
 
+* fixed `--diff` not showing entire path (#130)
+
 * fixed parsing of complex expressions after star and double stars in
   function parameters (#2)
 
diff --git a/black.py b/black.py
index dd2e2d1..eafc9e7 100644
--- a/black.py
+++ b/black.py
@@ -341,8 +341,8 @@ def format_file_in_place(
         with open(src, "w", encoding=src_buffer.encoding) as f:
             f.write(dst_contents)
     elif write_back == write_back.DIFF:
-        src_name = f"{src.name}  (original)"
-        dst_name = f"{src.name}  (formatted)"
+        src_name = f"{src}  (original)"
+        dst_name = f"{src}  (formatted)"
         diff_contents = diff(src_contents, dst_contents, src_name, dst_name)
         if lock:
             lock.acquire()
diff --git a/tests/test_black.py b/tests/test_black.py
index ba834c5..6f0ffa3 100644
--- a/tests/test_black.py
+++ b/tests/test_black.py
@@ -200,7 +200,7 @@ def test_expression_diff(self) -> None:
             self.assertTrue(ff(tmp_file, write_back=black.WriteBack.DIFF))
             sys.stdout.seek(0)
             actual = sys.stdout.read()
-            actual = actual.replace(tmp_file.name, "<stdin>")
+            actual = actual.replace(str(tmp_file), "<stdin>")
         finally:
             sys.stdout = hold_stdout
             os.unlink(tmp_file)