diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5d46635a6..eb56b17d1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 - fix(draw_triangle): fix polygon/triangle drawing when the order of points is counter-clockwise
 - fix(btnmatrix): fix setting the same map with modified pointers
 - fix(arc) fix and improve arc dragging
+- label: Repair calculate back `dot` character logical error which cause infinite loop.
 
 ## v7.7.1 (04.11.2020)
 ### Bugfixes
diff --git a/src/lv_widgets/lv_label.c b/src/lv_widgets/lv_label.c
index d56b4cbd5..865a8f02b 100644
--- a/src/lv_widgets/lv_label.c
+++ b/src/lv_widgets/lv_label.c
@@ -1191,7 +1191,7 @@ void lv_label_refr_text(lv_obj_t * label)
             size_t txt_len = strlen(ext->text);
             uint32_t byte_id     = _lv_txt_encoded_get_byte_id(ext->text, letter_id);
             while(byte_id + LV_LABEL_DOT_NUM > txt_len) {
-                byte_id -= _lv_txt_encoded_size(&ext->text[byte_id]);
+                _lv_txt_encoded_prev(ext->text, &byte_id);
                 letter_id--;
             }