diff --git a/promise/promise.py b/promise/promise.py
index a23f427..7132f8b 100644
--- a/promise/promise.py
+++ b/promise/promise.py
@@ -730,6 +730,8 @@ def _process_future_result(resolve, reject):
     def handle_future_result(future):
         exception = future.exception()
         if exception:
+            if hasattr(future, '_exc_info'):
+                exception.stack = future._exc_info[2]
             reject(exception)
         else:
             resolve(future.result())