diff --git a/sqlite3.go b/sqlite3.go
index 0ae415f..2d504d9 100644
--- a/sqlite3.go
+++ b/sqlite3.go
@@ -298,7 +298,7 @@ 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 {
 		// 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.
@@ -519,7 +519,7 @@ func (c *SQLiteConn) begin(ctx context.Context) (driver.Tx, error) {
 	return &SQLiteTx{c}, nil
 }
 
-func errorString(err Error) string {
+func errorString(err *Error) string {
 	return C.GoString(C.sqlite3_errstr(C.int(err.Code)))
 }