diff --git a/aider/diffs.py b/aider/diffs.py
index 4608e8e18..0c4763c64 100644
--- a/aider/diffs.py
+++ b/aider/diffs.py
@@ -47,8 +47,8 @@ def diff_partial_update(lines_orig, lines_updated, final=False, fname=None):
     partially complete update.
     """
 
-    # dump(lines_orig)
-    # dump(lines_updated)
+    dump(lines_orig)
+    dump(lines_updated)
 
     assert_newlines(lines_orig)
     assert_newlines(lines_orig)
@@ -80,21 +80,26 @@ def diff_partial_update(lines_orig, lines_updated, final=False, fname=None):
 
     diff = list(diff)[2:]
 
+    # TODO find the longest string of ` that start a line
+    max_backticks = max(len(line) - len(line.lstrip("`")) for line in diff.splitlines())
+    extra_backticks = "`" * (max_backticks + 1)
+
     diff = "".join(diff)
     if not diff.endswith("\n"):
         diff += "\n"
 
-    show = "```diff\n"
+    show = f"{extra_backticks}diff\n"
     if fname:
         show += f"--- {fname} original\n"
         show += f"+++ {fname} updated\n"
     if not final:
         show += bar
 
-    show += diff + "```\n\n"
+    show += diff + f"{extra_backticks}\n\n"
 
     # print(diff)
 
+    dump(repr(show))
     return show