diff --git a/aider/utils.py b/aider/utils.py
index e6cedff47..170eaf73b 100644
--- a/aider/utils.py
+++ b/aider/utils.py
@@ -230,10 +230,13 @@ def find_original_update_blocks(content):
             processed.append(cur)  # original_marker
 
             filename = processed[-2].splitlines()[-1].strip()
+    try:
+        if not len(filename) or "`" in filename:
+            filename = processed[-2].splitlines()[-2].strip()
             if not len(filename) or "`" in filename:
-                filename = processed[-2].splitlines()[-2].strip()
-                if not len(filename) or "`" in filename:
-                    raise ValueError(f"Bad/missing filename. It should go right above {ORIGINAL}")
+                raise ValueError(f"Bad/missing filename. It should go right above {ORIGINAL}")
+    except IndexError:
+        raise ValueError(f"Bad/missing filename. It should go right above {ORIGINAL}")
 
             original_text = pieces.pop()
             processed.append(original_text)