diff --git a/src/ocrmypdf/pipeline.py b/src/ocrmypdf/pipeline.py
index 869f3ffc..be9b0ae6 100644
--- a/src/ocrmypdf/pipeline.py
+++ b/src/ocrmypdf/pipeline.py
@@ -1038,7 +1038,13 @@ def merge_pages_mupdf(
         doc.insertPDF(page)
 
     metadata = fitz.open(metadata_file)
-    doc.setToC(metadata.getToC())
+    toc = metadata.getToC(simple=False)
+    def filter_toc_pages():
+        "fitz does not escape parens properly"
+        for entry in toc:
+            entry[1] = entry[1].replace('(', '').replace(')', '')
+            yield entry
+    doc.setToC([item for item in filter_toc_pages()])
     doc.setMetadata(pymupdf_metadata)
     doc.save(output_file, garbage=4, deflate=True)