diff --git a/src/mijnbib/mijnbibliotheek.py b/src/mijnbib/mijnbibliotheek.py
index 54ad5e8..8d89c2f 100644
--- a/src/mijnbib/mijnbibliotheek.py
+++ b/src/mijnbib/mijnbibliotheek.py
@@ -76,6 +76,7 @@ def __init__(self, username: str, password: str, city: str | None = None, login_
         self._loans_page_parser = LoansListPageParser()
         self._accounts_page_parser = AccountsListPageParser()
         self._reservations_parser = ReservationsPageParser()
+        self._extend_response_page_parser = ExtendResponsePageParser()
 
     # *** PUBLIC METHODS ***
 
@@ -278,7 +279,7 @@ def extend_loans(self, extend_url: str, execute: bool = False) -> tuple[bool, di
             # On submit, we arrive at "uitleningen" (loans) page, which lists the result
             html_string = response.read().decode("utf-8")  # type:ignore
             # Path("response.html").write_text("html_string")  # for debugging
-            details = ExtendResponsePageParser(html_string).parse()
+            details = self._extend_response_page_parser.parse(html_string)
             if "likely_success" in details and details["likely_success"] is False:
                 # Probably valid page (http=200) but with 'Foutmelding'
                 success = False
diff --git a/src/mijnbib/parsers.py b/src/mijnbib/parsers.py
index c2783b3..b3f7e90 100644
--- a/src/mijnbib/parsers.py
+++ b/src/mijnbib/parsers.py
@@ -26,18 +26,12 @@
 
 
 class Parser(ABC):
-    @abstractmethod
-    def parse(self):
-        pass
-
-
-class ParserNew(ABC):
     @abstractmethod
     def parse(self, html: str, *args, **kwargs):
         pass
 
 
-class LoansListPageParser(ParserNew):
+class LoansListPageParser(Parser):
     def parse(self, html: str, base_url: str, account_id: str) -> list[Loan]:
         """Return loans.
 
@@ -227,7 +221,7 @@ def _get_loan_info_from_div(
         )
 
 
-class AccountsListPageParser(ParserNew):
+class AccountsListPageParser(Parser):
     def parse(self, html: str, base_url: str) -> list[Account]:
         """Return list of accounts.
 
@@ -391,7 +385,7 @@ def _parse_item_count_from_li(acc_div, class_: str) -> int | None:
         return item_count
 
 
-class ReservationsPageParser(ParserNew):
+class ReservationsPageParser(Parser):
     def parse(self, html: str) -> list[Reservation]:
         """Return list of holds.
 
@@ -537,15 +531,13 @@ def parse(self, html: str) -> list[Reservation]:
 
 
 class ExtendResponsePageParser(Parser):
-    def __init__(self, html: str):
-        self._html = html
-
-    def parse(self) -> dict:
+    def parse(self, html) -> dict:
         """For dict structure, see the called method."""
-        html_blob = self._extract_html_from_response_script_tag()
+        html_blob = self._extract_html_from_response_script_tag(html)
         return self._parse_extend_response_status_blob(html_blob)
 
-    def _extract_html_from_response_script_tag(self):
+    @classmethod
+    def _extract_html_from_response_script_tag(cls, html: str):
         """Return html-encoded data from ajax encoded data.
 
         The extending loan response contains the result in a ajax script thingy.
@@ -558,7 +550,7 @@ def find_between(s: str, start: str, end: str):
             return s[s.find(start) + len(start) : s.rfind(end)]
 
         # find relevant snippet
-        soup = BeautifulSoup(self._html, "html.parser")
+        soup = BeautifulSoup(html, "html.parser")
         script_txt = soup.find(
             "script", string=re.compile("(Statusbericht|Foutmelding)")
         ).get_text()
diff --git a/tests/test_mijnbibliotheek.py b/tests/test_mijnbibliotheek.py
index 7fff699..d1a919a 100644
--- a/tests/test_mijnbibliotheek.py
+++ b/tests/test_mijnbibliotheek.py
@@ -207,3 +207,6 @@ def parse(self, _html):
 
         # Assert
         assert mb.get_reservations(account_id="whatever") == [res]
+
+    # def test_extendresponse_parser_can_be_overridden(self):
+    # Not so easy to write test for
diff --git a/tests/test_parsers.py b/tests/test_parsers.py
index c1ddc4c..b0018ba 100644
--- a/tests/test_parsers.py
+++ b/tests/test_parsers.py
@@ -59,9 +59,9 @@ def test_extract_html_from_response_script_tag(self):
         def clean_whitespace(s: str) -> str:
             return s.replace(" ", "").replace("\n", "")
 
-        actual_result = ExtendResponsePageParser(
+        actual_result = ExtendResponsePageParser._extract_html_from_response_script_tag(
             raw_html
-        )._extract_html_from_response_script_tag()
+        )
         assert clean_whitespace(actual_result) == clean_whitespace(expected_result)
 
     def test_parse_extend_response_status_blob__empty_case(self):