diff --git a/shelfmark/bypass/cookie_store.py b/shelfmark/bypass/cookie_store.py
index 2b4e1d3b..70a236b2 100644
--- a/shelfmark/bypass/cookie_store.py
+++ b/shelfmark/bypass/cookie_store.py
@@ -38,6 +38,10 @@ DDG_COOKIE_NAMES = {
     "ddg_last_challenge",
 }
 
+# Anna's Archive's own pass for its ?check=1 hop. Without it the hop 302s back
+# forever, however good the __ddg* clearance is.
+AA_COOKIE_NAMES = {"aa_ddg_check"}
+
 # DDoS-Guard cookies that describe *one* check rather than granting clearance, and so
 # must never be replayed on a later request. Observed live on Anna's Archive:
 #
@@ -88,7 +92,8 @@ def _should_extract_cookie(name: str, *, extract_all: bool) -> bool:
         return True
     is_cf = name in CF_COOKIE_NAMES or name.startswith("cf_")
     is_ddg = name in DDG_COOKIE_NAMES or name.startswith("__ddg")
-    return is_cf or is_ddg
+    is_aa = name in AA_COOKIE_NAMES
+    return is_cf or is_ddg or is_aa
 
 
 def _cookie_field(cookie: Any, name: str) -> Any:
diff --git a/tests/bypass/test_ddg_cookie_reuse.py b/tests/bypass/test_ddg_cookie_reuse.py
index 3bf64315..770efef5 100644
--- a/tests/bypass/test_ddg_cookie_reuse.py
+++ b/tests/bypass/test_ddg_cookie_reuse.py
@@ -1,11 +1,12 @@
 """DDoS-Guard cookie reuse between requests.
 
-Anna's Archive issues nine cookies after a solve, and they are not equivalent:
+Anna's Archive issues ten cookies after a solve, and they are not equivalent:
 
     __ddg1_/__ddg2_/__ddgid_   ~1 year   clearance
     __ddgmark_                 ~1 day
     __ddg5_                    session
     __ddg8_/__ddg9_/__ddg10_   ~40 min   one check: token, CLIENT IP, TIMESTAMP
+    aa_ddg_check               ~90 days  Anna's Archive's own pass for its ?check=1 hop
 
 Replaying the last three is what produces the ?check=1 redirect loop. They describe a
 single check, so once the timestamp ages out - or the egress IP changes, routine
@@ -97,6 +98,15 @@ def test_per_check_cookies_are_not_stored():
         assert ephemeral not in stored
 
 
+def test_aa_check_cookie_is_stored():
+    """Without aa_ddg_check the ?check=1 hop loops, whatever __ddg* is replayed."""
+    _store([_Cookie("__ddg1_", "a"), _Cookie("__ddg5_", "b"), _Cookie("aa_ddg_check", "ok")])
+
+    stored = ib.get_cf_cookies_for_domain("annas-archive.gl")
+
+    assert stored == {"__ddg1_": "a", "__ddg5_": "b", "aa_ddg_check": "ok"}
+
+
 def test_clearance_cookies_survive():
     _store([_Cookie("__ddg1_", "a"), _Cookie("__ddg2_", "b"), _Cookie("__ddgid_", "c")])