diff --git a/sqlite3.go b/sqlite3.go
index e037857d..6e67e7cc 100644
--- a/sqlite3.go
+++ b/sqlite3.go
@@ -494,7 +494,7 @@ func (ai *aggInfo) Done(ctx *C.sqlite3_context) {
 // Commit transaction.
 func (tx *SQLiteTx) Commit() error {
 	_, err := tx.c.exec(context.Background(), "COMMIT", nil)
-	if err != nil && err.(Error).Code == C.SQLITE_BUSY {
+	if err != nil && (err.(Error).Code == C.SQLITE_BUSY || err.(Error).Code == C.SQLITE_CONSTRAINT) {
 		// sqlite3 will leave the transaction open in this scenario.
 		// However, database/sql considers the transaction complete once we
 		// return from Commit() - we must clean up to honour its semantics.