diff --git a/src/box/txn.cc b/src/box/txn.cc
index 6d23a89b08c7c58f9264a65a6050b070dc5f4248..30c04c3aa0d5ed065fe4fcb57212dca9a77f7114 100644
--- a/src/box/txn.cc
+++ b/src/box/txn.cc
@@ -144,6 +144,7 @@ txn_begin(bool autocommit)
 		rlist_nil, txn_on_yield_or_stop, NULL, NULL
 	};
 	txn->autocommit = autocommit;
+	txn->engine_tx = NULL;
 	fiber_set_txn(fiber(), txn);
 	return txn;
 }
diff --git a/test/sophia/dml.result b/test/sophia/ddl.result
similarity index 100%
rename from test/sophia/dml.result
rename to test/sophia/ddl.result
diff --git a/test/sophia/dml.test.lua b/test/sophia/ddl.test.lua
similarity index 100%
rename from test/sophia/dml.test.lua
rename to test/sophia/ddl.test.lua