diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8b3fca0..063bda7 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        minor: [7, 8, 9, 11]
+        minor: [8, 9, 10, 11]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v1
diff --git a/karton/system/system.py b/karton/system/system.py
index 3fb78cb..420243a 100644
--- a/karton/system/system.py
+++ b/karton/system/system.py
@@ -75,20 +75,20 @@ def gc_collect_tasks(self) -> None:
         current_time = time.time()
         to_delete = []
 
-        queues_to_remove = set()
+        queues_to_clear = set()
         online_consumers = self.backend.get_online_consumers()
         for bind in self.backend.get_binds():
             identity = bind.identity
             if identity not in online_consumers and not bind.persistent:
                 # If offline and not persistent: mark queue to be removed
-                queues_to_remove.add(identity)
+                queues_to_clear.add(identity)
                 self.log.info("Non-persistent: removing bind %s", identity)
                 self.backend.unregister_bind(identity)
                 self.backend.delete_consumer_queues(identity)
 
         for task in self.backend.iter_all_tasks(parse_resources=False):
             root_tasks.add(task.root_uid)
-            if task.headers.get("receiver") in queues_to_remove:
+            if task.headers.get("receiver") in queues_to_clear:
                 to_delete.append(task)
                 self.log.info(
                     "Task %s is abandoned by inactive non-persistent consumer."