diff --git a/src/epub_converter/epub_converter.py b/src/epub_converter/epub_converter.py
index dbf3509..3cd55fb 100644
--- a/src/epub_converter/epub_converter.py
+++ b/src/epub_converter/epub_converter.py
@@ -309,7 +309,7 @@ class EpubConverter:
 
     @staticmethod
     def create_unique_id(href: str, id_: str) -> str:
-        return re.sub(r"([^\w\s])|_|-", "", href) + re.sub(r"[_-]", "0", id_)
+        return "id" + re.sub(r'[\W_]+', "", href) + re.sub(r'[\W_]+', "0", id_)
 
     def match_href_to_path_from_toc(self,
                                     cur_file_path: str,