diff --git a/bumble/device.py b/bumble/device.py
index d1b4f31c..2237e207 100644
--- a/bumble/device.py
+++ b/bumble/device.py
@@ -4727,7 +4727,7 @@ class Device(utils.CompositeEventEmitter):
         self, cis_acl_pairs: Sequence[tuple[int, Connection]]
     ) -> list[CisLink]:
         for cis_handle, acl_connection in cis_acl_pairs:
-            cis_id, cig_id = self._pending_cis.pop(cis_handle)
+            cis_id, cig_id = self._pending_cis[cis_handle]
             self.cis_links[cis_handle] = CisLink(
                 device=self,
                 acl_connection=acl_connection,
@@ -4743,6 +4743,7 @@ class Device(utils.CompositeEventEmitter):
             }
 
             def on_cis_establishment(cis_link: CisLink) -> None:
+                self._pending_cis.pop(cis_link.handle)
                 if pending_future := pending_cis_establishments.get(cis_link.handle):
                     pending_future.set_result(cis_link)