diff --git a/src/sounddevice.py b/src/sounddevice.py
index 00fc6f8..86a6f03 100644
--- a/src/sounddevice.py
+++ b/src/sounddevice.py
@@ -1927,7 +1927,7 @@ class CallbackFlags:
     __slots__ = '_flags'
 
     def __init__(self, flags=0x0):
-        self._flags = flags
+        self._flags = int(flags)
 
     def __repr__(self):
         flags = str(self)
@@ -2772,7 +2772,9 @@ def _get_stream_parameters(kind, device, channels, dtype, latency,
 
 def _wrap_callback(callback, *args):
     """Invoke callback function and check for custom exceptions."""
-    args = args[:-1] + (CallbackFlags(args[-1]),)
+    cf = CallbackFlags.__new__(CallbackFlags)
+    cf._flags = int(args[-1])
+    args = args[:-1] + (cf,)
     try:
         callback(*args)
     except CallbackStop:
@@ -2781,7 +2783,6 @@ def _wrap_callback(callback, *args):
         return _lib.paAbort
     return _lib.paContinue
 
-
 def _buffer(ptr, frames, channels, samplesize):
     """Create a buffer object from a pointer to some memory."""
     return _ffi.buffer(ptr, frames * channels * samplesize)