diff --git a/ryu/controller/controller.py b/ryu/controller/controller.py
index 8f06c1e2..a2f98b18 100644
--- a/ryu/controller/controller.py
+++ b/ryu/controller/controller.py
@@ -68,7 +68,7 @@ def _deactivate(method):
         except greenlet.GreenletExit:
             pass
         except:
-            traceback.print_stack()
+            traceback.print_exc()
             raise
         finally:
             self.is_active = False