diff --git a/resources/sql/autopatches/20141001.schema.02.taskmail.sql b/resources/sql/autopatches/20141001.schema.02.taskmail.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20141001.schema.02.taskmail.sql
@@ -0,0 +1,2 @@
+UPDATE {$NAMESPACE}_maniphest.maniphest_task
+  SET mailKey = SUBSTRING(mailKey, 1, 20) WHERE LENGTH(mailKey) > 20;