diff --git a/pgutil/errors.go b/pgutil/errors.go
index ec26f75..fce709d 100644
--- a/pgutil/errors.go
+++ b/pgutil/errors.go
@@ -14,7 +14,7 @@ func ErrIsForeignKey(err error) bool {
 	return ErrHasCode(err, "23503")
 }
 
-func ErrIsSerializationFaiilure(err error) bool {
+func ErrIsSerializationFailure(err error) bool {
 	return ErrHasCode(err, "40001")
 }
 
diff --git a/pgutil/tx.go b/pgutil/tx.go
index 9d7156f..ceb7985 100644
--- a/pgutil/tx.go
+++ b/pgutil/tx.go
@@ -60,7 +60,7 @@ func (r SerialTxRunner) WithTx(db *sql.DB, fn func(*sql.Tx) error) error {
 		if err == nil {
 			return nil
 		}
-		if timeout > r.MaxTimeout || !ErrIsSerializationFaiilure(err) {
+		if timeout > r.MaxTimeout || !ErrIsSerializationFailure(err) {
 			return err
 		}
 		sleepTimeout := timeout + time.Duration(rand.Int63n(int64(timeout/10)))
diff --git a/sqliteutil/errors.go b/sqliteutil/errors.go
new file mode 100644
index 0000000..b0db407
--- /dev/null
+++ b/sqliteutil/errors.go
@@ -0,0 +1,8 @@
+package sqliteutil
+
+import "github.com/mattn/go-sqlite3"
+
+func ErrIsDuplicate(err error) bool {
+	e, ok := err.(sqlite3.Error)
+	return ok && e.Code == 19
+}