diff --git a/devel/201_80.md b/devel/201_80.md
new file mode 100644
index 0000000000..ecf48b5aab
--- /dev/null
+++ b/devel/201_80.md
@@ -0,0 +1,6 @@
+# [201_80] 修复/ / 的乐高符号Tab循环高亮显示问题
+
+## 如何测试
+1. 进入数学模式输入`/` `/`，出现斜着的平行符号，Tab一次是竖着的，两次是`//`。
+2. 观察Tab循环高亮是否正常显示。
+
diff --git a/src/Texmacs/Window/tm_button.cpp b/src/Texmacs/Window/tm_button.cpp
index 0c65f2f014..36fddcf393 100644
--- a/src/Texmacs/Window/tm_button.cpp
+++ b/src/Texmacs/Window/tm_button.cpp
@@ -251,7 +251,7 @@ box_widget (scheme_tree p, string s, color col, bool trans, bool ink) {
   if ((n >= 5) && is_atomic (p[4])) sz= as_int (p[4]);
   if ((n >= 6) && is_atomic (p[5])) dpi= as_int (p[5]);
   if ((n >= 7) && is_atomic (p[6])) dw= as_int (p[6]);
-  font fn= find_font (family, fn_class, series, shape, sz, dpi);
+  font fn= smart_font (family, fn_class, series, shape, sz, dpi);
   box  b = text_box (decorate (), 0, s, fn, col);
   if (ink) b= resize_box (decorate (), b, b->x3, b->y3, b->x4, b->y4, true);
   return box_widget (b, trans, dw);