diff --git a/cpdfcommand.ml b/cpdfcommand.ml
index a5468e9..0d8c413 100644
--- a/cpdfcommand.ml
+++ b/cpdfcommand.ml
@@ -461,7 +461,7 @@ type args =
    mutable boxes : bool;
    mutable encrypt_metadata : bool;
    mutable retain_numbering : bool;
-   mutable merge_struct_trees : bool;
+   mutable process_struct_trees : bool;
    mutable remove_duplicate_fonts : bool;
    mutable remove_duplicate_streams : bool;
    mutable encoding : Cpdfmetadata.encoding;
@@ -596,7 +596,7 @@ let args =
    boxes = false;
    encrypt_metadata = true;
    retain_numbering = false;
-   merge_struct_trees = true;
+   process_struct_trees = true;
    remove_duplicate_fonts = false;
    remove_duplicate_streams = false;
    encoding = Cpdfmetadata.UTF8;
@@ -736,7 +736,7 @@ let reset_arguments () =
   args.boxes <- false;
   args.encrypt_metadata <- true;
   args.retain_numbering <- false;
-  args.merge_struct_trees <- true;
+  args.process_struct_trees <- true;
   args.remove_duplicate_fonts <- false;
   args.remove_duplicate_streams <- false;
   args.encoding <- Cpdfmetadata.UTF8;
@@ -2022,8 +2022,8 @@ let setextractstreamdecomp i =
 let setprintobj i =
   args.op <- Some (PrintObj i)
 
-let setnomergestructtrees () =
-  args.merge_struct_trees <- false
+let setnoprocessstructtrees () =
+  args.process_struct_trees <- false
 
 (* Parse a control file, make an argv, and then make Arg parse it. *)
 let rec make_control_argv_and_parse filename =
@@ -2141,9 +2141,9 @@ and specs =
    ("-merge-add-bookmarks-use-titles",
        Arg.Unit setmergeaddbookmarksusetitles,
        " Use title of document rather than filename");
-   ("-no-merge-struct-trees",
-       Arg.Unit setnomergestructtrees,
-       " Do not merge structure trees");
+   ("-no-process-struct-trees",
+       Arg.Unit setnoprocessstructtrees,
+       " Do not process structure trees");
    ("-remove-duplicate-fonts",
        Arg.Unit set_remove_duplicate_fonts,
        " Remove duplicate fonts when merging");
@@ -3598,12 +3598,7 @@ let extract_stream pdf decomp objnum =
         output_string stdout (Pdfio.string_of_bytes data)
 
 let print_obj pdf objnum =
-  let obj =
-    if objnum = 0 then
-      pdf.Pdf.trailerdict
-    else
-      Pdf.lookup_obj pdf objnum
-  in
+  let obj = if objnum = 0 then pdf.Pdf.trailerdict else Pdf.lookup_obj pdf objnum in
     Printf.printf "%S\n" (Pdfwrite.string_of_pdf obj)
 
 (* Main function *)
@@ -3670,7 +3665,7 @@ let go () =
                         in
                         let outpdf =
                           Pdfmerge.merge_pdfs
-                            args.retain_numbering args.remove_duplicate_fonts ~struct_hierarchy:args.merge_struct_trees names pdfs rangenums
+                            args.retain_numbering args.remove_duplicate_fonts ~struct_hierarchy:args.process_struct_trees names pdfs rangenums
                         in
                           if args.remove_duplicate_streams then Pdfmerge.remove_duplicate_fonts outpdf; (* JBIG2 Globals *)
                           write_pdf false outpdf