diff options
| -rw-r--r-- | src/python/src/grpc/framework/face/_calls.py | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/python/src/grpc/framework/face/_calls.py b/src/python/src/grpc/framework/face/_calls.py index 75a550e3c7..87edeb0f0e 100644 --- a/src/python/src/grpc/framework/face/_calls.py +++ b/src/python/src/grpc/framework/face/_calls.py @@ -248,7 +248,7 @@ class _OperationFuture(future.Future): """See future.Future.add_done_callback for specification.""" with self._condition: if self._callbacks is not None: - self._callbacks.add(fn) + self._callbacks.append(fn) return callable_util.call_logging_exceptions(fn, _DONE_CALLBACK_LOG_MESSAGE, self) |