diff --git a/deps/oblib/src/lib/charset/ob_charset.cpp b/deps/oblib/src/lib/charset/ob_charset.cpp
index 58e41f88b..c604e776d 100644
--- a/deps/oblib/src/lib/charset/ob_charset.cpp
+++ b/deps/oblib/src/lib/charset/ob_charset.cpp
@@ -1413,6 +1413,7 @@ int ObCharset::display_len(ObCollationType collation_type,
         int bytes = cs->cset->mb_wc(cs, &wc, buf + char_pos, buf + buf_size);
 
         if (bytes < 0) {
+          width = 1;
           found = true;
         } else {
           int w = 0;