diff --git a/lib/tfw/decorators/rate_limiter.py b/lib/tfw/decorators/rate_limiter.py
index e0c87d1..371e732 100644
--- a/lib/tfw/decorators/rate_limiter.py
+++ b/lib/tfw/decorators/rate_limiter.py
@@ -59,17 +59,23 @@ class RateLimiter:
         return 0
 
 
+# TODO document this
 class AsyncRateLimiter(RateLimiter):
     def __init__(self, rate_per_second, ioloop_factory):
         self._ioloop_factory = ioloop_factory
         self._ioloop = None
         self._last_callback = None
 
+        self._make_action_thread_safe()
+
         super().__init__(
             rate_per_second=rate_per_second,
             action=self.async_action
         )
 
+    def _make_action_thread_safe(self):
+        self.async_action = partial(self.ioloop.add_callback, self.async_action)
+
     @lazy_property
     def ioloop(self):
         return self._ioloop_factory()