diff --git a/src/box/memtx_tx.c b/src/box/memtx_tx.c
index aa16ea7ac1b3..96b42775820a 100644
--- a/src/box/memtx_tx.c
+++ b/src/box/memtx_tx.c
@@ -1980,6 +1980,7 @@ memtx_tx_history_add_insert_stmt(struct txn_stmt *stmt,
 			   &old_tuple, mode, &is_own_change);
 	if (rc != 0)
 		goto fail;
+	stmt->is_own_change = is_own_change;
 
 	/* Create add_story and replaced_story if necessary. */
 	add_story = memtx_tx_story_new(space, new_tuple);
@@ -2022,8 +2023,7 @@ memtx_tx_history_add_insert_stmt(struct txn_stmt *stmt,
 		else
 			del_story = memtx_tx_story_get(old_tuple);
 		memtx_tx_story_link_deleted_by(del_story, stmt);
-	} else if (is_own_change)
-		stmt->is_pure_insert = true;
+	}
 
 	/*
 	 * In case of DUP_INSERT there must be no visible replaced tuple. It is
@@ -2090,6 +2090,9 @@ memtx_tx_history_add_delete_stmt(struct txn_stmt *stmt,
 
 	if (tuple_has_flag(old_tuple, TUPLE_IS_DIRTY)) {
 		del_story = memtx_tx_story_get(old_tuple);
+		if (del_story->add_stmt != NULL)
+			stmt->is_own_change =
+				del_story->add_stmt->txn == stmt->txn;
 	} else {
 		assert(stmt->txn != NULL);
 		del_story = memtx_tx_story_new(space, old_tuple);
@@ -2313,7 +2316,8 @@ memtx_tx_history_prepare_insert_stmt(struct txn_stmt *stmt)
 			struct txn_stmt *test_stmt = test->add_stmt;
 			if (test_stmt->txn == stmt->txn)
 				continue;
-			if (test_stmt->is_pure_insert)
+			if (test_stmt->is_own_change &&
+			    test_stmt->del_story == NULL)
 				continue;
 			if (test_stmt->del_story != NULL) {
 				assert(test_stmt->del_story->add_stmt->txn
@@ -2388,7 +2392,8 @@ memtx_tx_history_prepare_insert_stmt(struct txn_stmt *stmt)
 			struct txn_stmt *test_stmt = test->add_stmt;
 			if (test_stmt->txn == stmt->txn)
 				continue;
-			if (test_stmt->is_pure_insert)
+			if (test_stmt->is_own_change &&
+			    test_stmt->del_story == NULL)
 				continue;
 			if (test_stmt->del_story == story)
 				continue;
diff --git a/src/box/txn.c b/src/box/txn.c
index cf8b1b00d3b4..16f44c730ee6 100644
--- a/src/box/txn.c
+++ b/src/box/txn.c
@@ -306,7 +306,7 @@ txn_stmt_new(struct txn *txn)
 	stmt->engine_savepoint = NULL;
 	stmt->row = NULL;
 	stmt->has_triggers = false;
-	stmt->is_pure_insert = false;
+	stmt->is_own_change = false;
 	return stmt;
 }
 
diff --git a/src/box/txn.h b/src/box/txn.h
index 610df490b1a9..03ef60a25360 100644
--- a/src/box/txn.h
+++ b/src/box/txn.h
@@ -302,13 +302,13 @@ struct txn_stmt {
 	/** on_commit and/or on_rollback list is not empty. */
 	bool has_triggers;
 	/*
-	 * `insert` statement is guaranteed not to delete anything
-	 * from the transaction's point of view (i.e., there was a preceding
-	 * `delete` in the scope of the same transaction): no linking to the
-	 * list of `delete` statements is required during preparation of insert
-	 * statements that add preceding stories.
+	 * Flag that shows whether this statement overwrites own transaction
+	 * statement. For example if a transaction makes two replaces of the
+	 * same key, the second statement will be with is_own_change = true.
+	 * Or if a transaction deletes some key and then inserts that key,
+	 * the insertion statement will be with is_own_change = true.
 	 */
-	bool is_pure_insert;
+	bool is_own_change;
 	/**
 	* Request type - IPROTO type code
 	*/