diff --git a/post_processing.py b/post_processing.py
index d95bcfe54fb36654c1b0c955f5ebe27df8a4bf8e..a179abb1508283f13e7bccd792f40162497cc4c8 100755
--- a/post_processing.py
+++ b/post_processing.py
@@ -102,18 +102,21 @@ def replace_files(uncompressed_dir_path, original_files_dir_path):
                     # directories already exists
                     pass
                 
-                if "__" in header_line and "/" in header_line: # means the file is a split file that needs to be merged with the corresponding other split files
-                    subfile_number_str, subfile_total_str = header_line.split("__")[1].split("/") # get the number of splits and the split index for this subfile
-                    subfile_number, subfile_total = int(subfile_number_str), int(subfile_total_str) # warning, subfile count starts from 1
-                    
-                    # get the list of subfiles lines for the same file, or init the list with size = number of subfiles
-                    split_files_dict[original_file_path] = split_files_dict.get(original_file_path, ["" for i in range(subfile_total)])
-                    
-                    if split_files_dict[original_file_path][subfile_number-1] != "": # use subfile_number-1 because it starts from 1 and not 0
-                        print("warning post processing (replace_files) : a subfile with the same number already exists",filename,original_file_path, subfile_number)
-                    else:
-                        # save the bytes of this subfile
-                        split_files_dict[original_file_path][subfile_number-1] = b"".join(small_file_bytes_lines[1:])
+                if "__" in header_line: # means the file is a split file that needs to be merged with the corresponding other split files
+                    # should be like "path/basename__1/3"
+                    header_counter = header_line.split("__")[-1]
+                    if "/" in header_counter: # if the '__' was in the basename of the file, it's not for the counter
+                        subfile_number_str, subfile_total_str = header_counter.split("/") # get the number of splits and the split index for this subfile
+                        subfile_number, subfile_total = int(subfile_number_str), int(subfile_total_str) # warning, subfile count starts from 1
+                        
+                        # get the list of subfiles lines for the same file, or init the list with size = number of subfiles
+                        split_files_dict[original_file_path] = split_files_dict.get(original_file_path, ["" for i in range(subfile_total)])
+                        
+                        if split_files_dict[original_file_path][subfile_number-1] != "": # use subfile_number-1 because it starts from 1 and not 0
+                            print("warning post processing (replace_files) : a subfile with the same number already exists",filename,original_file_path, subfile_number)
+                        else:
+                            # save the bytes of this subfile
+                            split_files_dict[original_file_path][subfile_number-1] = b"".join(small_file_bytes_lines[1:])
                 
                 else:
                     # write the content without the header line in the file