diff --git a/src/box/sql/tokenize.c b/src/box/sql/tokenize.c
index 58685c4..834c165 100644
--- a/src/box/sql/tokenize.c
+++ b/src/box/sql/tokenize.c
@@ -483,7 +483,9 @@ sqlRunParser(Parse * pParse, const char *zSql, char **pzErrMsg)
            &pParse->sLastToken.isReserved);
    i += pParse->sLastToken.n;
    if (i > mxSqlLen) {
-       pParse->rc = SQL_TOOBIG;
+       diag_set(ClientError, ER_SQL_PARSER_GENERIC,
+          "string or blob too big”);

I would add to error message max possible length.

I will add this change in review fix of patch
"sql: rework semantic errors". Btw I wasn't able to reproduce this
error due to limit being too big. So I got an error:
"error: not enough memory". Due to this I didn't create test for
this error.