diff --git a/django/db/transaction.py b/django/db/transaction.py
index c0c3779f6a..cd27cf6044 100644
--- a/django/db/transaction.py
+++ b/django/db/transaction.py
@@ -196,7 +196,10 @@ def commit_on_success(func):
             managed(True)
             try:
                 res = func(*args, **kw)
-            except Exception, e:
+            except (Exception, KeyboardInterrupt, SystemExit):
+                # (We handle KeyboardInterrupt and SystemExit specially, since
+                # they don't inherit from Exception in Python 2.5, but we
+                # should treat them uniformly here.)
                 if is_dirty():
                     rollback()
                 raise