diff --git a/pylib/anki/consts.py b/pylib/anki/consts.py
index ddeddd03b..c512f091d 100644
--- a/pylib/anki/consts.py
+++ b/pylib/anki/consts.py
@@ -17,6 +17,7 @@ NEW_CARDS_DUE = 1
 # Queue types
 QUEUE_TYPE_MANUALLY_BURIED = -3
 QUEUE_TYPE_SIBLING_BURIED = -2
+QUEUE_TYPE_SUSPENDED = -1
 QUEUE_TYPE_NEW = 0
 QUEUE_TYPE_LRN = 1
 
diff --git a/pylib/anki/sched.py b/pylib/anki/sched.py
index 7fcc07257..26e065635 100644
--- a/pylib/anki/sched.py
+++ b/pylib/anki/sched.py
@@ -893,7 +893,7 @@ select id from cards where did in %s and queue = 2 and due <= ? limit ?)"""
                 card.odue = card.due
         # if suspended as a leech, nothing to do
         delay = 0
-        if self._checkLeech(card, conf) and card.queue == -1:
+        if self._checkLeech(card, conf) and card.queue == QUEUE_TYPE_SUSPENDED:
             return delay
         # if no relearning steps, nothing to do
         if not conf["delays"]:
@@ -1152,7 +1152,7 @@ did = ?, queue = %s, due = ?, usn = ? where id = ?"""
                 if card.odid:
                     card.did = card.odid
                 card.odue = card.odid = 0
-                card.queue = -1
+                card.queue = QUEUE_TYPE_SUSPENDED
             # notify UI
             hooks.card_did_leech(card)
             return True
@@ -1391,7 +1391,7 @@ To study outside of the normal schedule, click the Custom Study button below."""
         self.remFromDyn(ids)
         self.removeLrn(ids)
         self.col.db.execute(
-            "update cards set queue=-1,mod=?,usn=? where id in " + ids2str(ids),
+            f"update cards set queue={QUEUE_TYPE_SUSPENDED},mod=?,usn=? where id in " + ids2str(ids),
             intTime(),
             self.col.usn(),
         )
@@ -1401,7 +1401,7 @@ To study outside of the normal schedule, click the Custom Study button below."""
         self.col.log(ids)
         self.col.db.execute(
             "update cards set queue=type,mod=?,usn=? "
-            "where queue = -1 and id in " + ids2str(ids),
+            f"where queue = {QUEUE_TYPE_SUSPENDED} and id in " + ids2str(ids),
             intTime(),
             self.col.usn(),
         )
diff --git a/pylib/anki/schedv2.py b/pylib/anki/schedv2.py
index 9dc4a4c5d..613e44d1c 100644
--- a/pylib/anki/schedv2.py
+++ b/pylib/anki/schedv2.py
@@ -976,7 +976,7 @@ select id from cards where did in %s and queue = 2 and due <= ? limit ?)"""
         card.lapses += 1
         card.factor = max(1300, card.factor - 200)
 
-        suspended = self._checkLeech(card, conf) and card.queue == -1
+        suspended = self._checkLeech(card, conf) and card.queue == QUEUE_TYPE_SUSPENDED
 
         if conf["delays"] and not suspended:
             card.type = CARD_TYPE_RELEARNING
@@ -987,7 +987,7 @@ select id from cards where did in %s and queue = 2 and due <= ? limit ?)"""
             self._rescheduleAsRev(card, conf, early=False)
             # need to reset the queue after rescheduling
             if suspended:
-                card.queue = -1
+                card.queue = QUEUE_TYPE_SUSPENDED
             delay = 0
 
         return delay
@@ -1285,7 +1285,7 @@ where id = ?
             # handle
             a = conf["leechAction"]
             if a == LEECH_SUSPEND:
-                card.queue = -1
+                card.queue = QUEUE_TYPE_SUSPENDED
             # notify UI
             hooks.card_did_leech(card)
             return True
@@ -1616,7 +1616,7 @@ end)
         "Suspend cards."
         self.col.log(ids)
         self.col.db.execute(
-            "update cards set queue=-1,mod=?,usn=? where id in " + ids2str(ids),
+            f"update cards set queue={QUEUE_TYPE_SUSPENDED},mod=?,usn=? where id in " + ids2str(ids),
             intTime(),
             self.col.usn(),
         )
@@ -1625,7 +1625,7 @@ end)
         "Unsuspend cards."
         self.col.log(ids)
         self.col.db.execute(
-            ("update cards set %s,mod=?,usn=? " "where queue = -1 and id in %s")
+            (f"update cards set %s,mod=?,usn=? where queue = {QUEUE_TYPE_SUSPENDED} and id in %s")
             % (self._restoreQueueSnippet, ids2str(ids)),
             intTime(),
             self.col.usn(),
diff --git a/pylib/tests/test_schedv1.py b/pylib/tests/test_schedv1.py
index 9e69873c7..7b75a710e 100644
--- a/pylib/tests/test_schedv1.py
+++ b/pylib/tests/test_schedv1.py
@@ -376,9 +376,9 @@ def test_reviews():
     hooks.card_did_leech.append(onLeech)
     d.sched.answerCard(c, 1)
     assert hooked
-    assert c.queue == -1
+    assert c.queue == QUEUE_TYPE_SUSPENDED
     c.load()
-    assert c.queue == -1
+    assert c.queue == QUEUE_TYPE_SUSPENDED
 
 
 def test_button_spacing():
diff --git a/pylib/tests/test_schedv2.py b/pylib/tests/test_schedv2.py
index 88181b100..db76ad460 100644
--- a/pylib/tests/test_schedv2.py
+++ b/pylib/tests/test_schedv2.py
@@ -398,9 +398,9 @@ def test_reviews():
     hooks.card_did_leech.append(onLeech)
     d.sched.answerCard(c, 1)
     assert hooked
-    assert c.queue == -1
+    assert c.queue == QUEUE_TYPE_SUSPENDED
     c.load()
-    assert c.queue == -1
+    assert c.queue == QUEUE_TYPE_SUSPENDED
 
 
 def test_review_limits():