diff --git a/qt/aqt/mpv.py b/qt/aqt/mpv.py
index 7a13c5b7d..e0de10e44 100644
--- a/qt/aqt/mpv.py
+++ b/qt/aqt/mpv.py
@@ -433,6 +433,9 @@ class MPV(MPVBase):
     """
 
     def __init__(self, *args, **kwargs):
+        self._callbacks_queue = Queue()
+        self._callbacks_initialized = False
+
         super().__init__(*args, **kwargs)
 
         self._callbacks = {}
@@ -455,6 +458,14 @@ class MPV(MPVBase):
                 name = name.replace("_", "-")
                 self.register_callback(name, method)
 
+        self._callbacks_initialized = True
+        while True:
+            try:
+                message = self._callbacks_queue.get_nowait()
+            except Empty:
+                break
+            self._handle_event(message)
+
         # Simulate an init event when the process and all callbacks have been
         # completely set up.
         if hasattr(self, "on_init"):
@@ -495,6 +506,10 @@ class MPV(MPVBase):
     def _handle_event(self, message):
         """Lookup and call the callbacks for a particular event message.
         """
+        if not self._callbacks_initialized:
+            self._callbacks_queue.put(message)
+            return
+
         if message["event"] == "property-change":
             name = "property-" + message["name"]
         else: