diff --git a/contrib/tsearch2/ispell/spell.c b/contrib/tsearch2/ispell/spell.c
index cbb6b61a73f46db6689259de0a367dd4edd0b0d1..54d0410af33ecf27d91b683711fe4d2c4081119d 100644
--- a/contrib/tsearch2/ispell/spell.c
+++ b/contrib/tsearch2/ispell/spell.c
@@ -813,7 +813,7 @@ CheckAffix(const char *word, size_t len, AFFIX * Affix, char flagflags, char *ne
 		data = (pg_wchar *) palloc((dat_len + 1) * sizeof(pg_wchar));
 		data_len = pg_mb2wchar_with_len(newword, data, dat_len);
 
-		if (!(err = pg_regexec(&(Affix->reg.regex), data, dat_len, NULL, 1, subs, 0)))
+		if (!(err = pg_regexec(&(Affix->reg.regex), data, dat_len, 0, NULL, 1, subs, 0)))
 		{
 			pfree(data);
 			return newword;