diff --git a/deltachat-rpc-client/src/deltachat_rpc_client/rpc.py b/deltachat-rpc-client/src/deltachat_rpc_client/rpc.py
index 4a181c528..024090283 100644
--- a/deltachat-rpc-client/src/deltachat_rpc_client/rpc.py
+++ b/deltachat-rpc-client/src/deltachat_rpc_client/rpc.py
@@ -4,7 +4,7 @@ import os
 import subprocess
 import sys
 from queue import Queue
-from threading import Event, Thread
+from threading import Event, Lock, Thread
 from typing import Any, Dict, Optional
 
 
@@ -24,6 +24,7 @@ class Rpc:
         self._kwargs = kwargs
         self.process: subprocess.Popen
         self.id: int
+        self.id_lock: Lock
         self.event_queues: Dict[int, Queue]
         # Map from request ID to `threading.Event`.
         self.request_events: Dict[int, Event]
@@ -55,6 +56,7 @@ class Rpc:
                 **self._kwargs,
             )
         self.id = 0
+        self.id_lock = Lock()
         self.event_queues = {}
         self.request_events = {}
         self.request_results = {}
@@ -143,14 +145,16 @@ class Rpc:
 
     def __getattr__(self, attr: str):
         def method(*args) -> Any:
+            self.id_lock.acquire()
             self.id += 1
             request_id = self.id
+            self.id_lock.release()
 
             request = {
                 "jsonrpc": "2.0",
                 "method": attr,
                 "params": args,
-                "id": self.id,
+                "id": request_id,
             }
             event = Event()
             self.request_events[request_id] = event