diff --git a/game/ato/airtaaskingorder.py b/game/ato/airtaaskingorder.py
index 41a4424f..fca03835 100644
--- a/game/ato/airtaaskingorder.py
+++ b/game/ato/airtaaskingorder.py
@@ -25,5 +25,5 @@ class AirTaskingOrder:
     def clear(self) -> None:
         """Removes all packages from the ATO."""
         # Remove all packages individually so the database gets updated.
-        for package in self.packages:
+        for package in list(self.packages):
             self.remove_package(package)