diff --git a/aider/coders/wholefile_coder.py b/aider/coders/wholefile_coder.py
index 4c862f2e4..bcba5060b 100644
--- a/aider/coders/wholefile_coder.py
+++ b/aider/coders/wholefile_coder.py
@@ -35,6 +35,7 @@ class WholeFileCoder(Coder):
 
         output = []
         lines = content.splitlines(keepends=True)
+
         fname = None
         new_lines = []
         for i, line in enumerate(lines):
@@ -65,16 +66,16 @@ class WholeFileCoder(Coder):
 
                 # starting a new block
                 if i == 0:
-                    raise ValueError("No filename provided before ``` block")
-
-                fname = lines[i - 1].strip()
-                if fname not in chat_files:
                     if len(chat_files) == 1:
-                        fname = list(chat_files)[0]
+                        fname = chat_files[0]
                     else:
-                        show_chat_files = " ".join(chat_files)
-                        # TODO: adopt the new allowed_to_edit()
-                        raise ValueError(f"{fname} is not one of: {show_chat_files}")
+                        # TODO: sense which file it is by diff size
+                        raise ValueError("No filename provided before ``` block")
+                else:
+                    fname = lines[i - 1].strip()
+
+                if mode == "update" and not self.allowed_to_edit(fname):
+                    raise ValueError(f"{fname} is not one of: {show_chat_files}")
 
             elif fname:
                 new_lines.append(line)
diff --git a/tests/test_wholefile.py b/tests/test_wholefile.py
index e69de29bb..2c71407fd 100644
--- a/tests/test_wholefile.py
+++ b/tests/test_wholefile.py
@@ -0,0 +1,36 @@
+import os
+from pathlib import Path
+import tempfile
+import unittest
+
+from aider.coders.wholefile_coder import WholeFileCoder
+from aider.io import InputOutput
+
+class TestWholeFileCoder(unittest.TestCase):
+    def test_update_files(self):
+        with tempfile.TemporaryDirectory() as temp_dir:
+            # Create a sample file in the temporary directory
+            sample_file = os.path.join(temp_dir, "sample.txt")
+            with open(sample_file, "w") as f:
+                f.write("Original content\n")
+
+            # Initialize WholeFileCoder with the temporary directory
+            io = InputOutput()
+            coder = WholeFileCoder(root=temp_dir, io=io)
+
+            # Set the partial response content with the updated content
+            coder.partial_response_content = f"{sample_file}\n```\nUpdated content\n```"
+
+            # Call update_files method
+            edited_files = coder.update_files()
+
+            # Check if the sample file was updated
+            self.assertIn("sample.txt", edited_files)
+
+            # Check if the content of the sample file was updated
+            with open(sample_file, "r") as f:
+                updated_content = f.read()
+            self.assertEqual(updated_content, "Updated content\n")
+
+if __name__ == "__main__":
+    unittest.main()