diff --git a/src/socketio/async_client.py b/src/socketio/async_client.py
index c7f5e86..0fa35dc 100644
--- a/src/socketio/async_client.py
+++ b/src/socketio/async_client.py
@@ -158,7 +158,7 @@ class AsyncClient(base_client.BaseClient):
                 await self._handle_reconnect()
                 if self.eio.state == 'connected':
                     return
-            raise exceptions.ConnectionError(exc.args[0]) from None
+            raise exceptions.ConnectionError(exc.args[0]) from exc
 
         if wait:
             try:
diff --git a/src/socketio/client.py b/src/socketio/client.py
index 746d2c4..84b1643 100644
--- a/src/socketio/client.py
+++ b/src/socketio/client.py
@@ -156,7 +156,7 @@ class Client(base_client.BaseClient):
                 self._handle_reconnect()
                 if self.eio.state == 'connected':
                     return
-            raise exceptions.ConnectionError(exc.args[0]) from None
+            raise exceptions.ConnectionError(exc.args[0]) from exc
 
         if wait:
             while self._connect_event.wait(timeout=wait_timeout):