diff --git a/adafruit_minimqtt/adafruit_minimqtt.py b/adafruit_minimqtt/adafruit_minimqtt.py
index 64e56581..7ede9559 100644
--- a/adafruit_minimqtt/adafruit_minimqtt.py
+++ b/adafruit_minimqtt/adafruit_minimqtt.py
@@ -578,7 +578,7 @@ def disconnect(self) -> None:
         except RuntimeError as e:
             self.logger.warning(f"Unable to send DISCONNECT packet: {e}")
         self.logger.debug("Closing socket")
-        self._connection_manager.free_socket(self._sock)
+        self._connection_manager.close_socket(self._sock)
         self._is_connected = False
         self._subscribed_topics = []
         self._last_msg_sent_timestamp = 0