diff --git a/src/less/lib/constant.less b/src/less/lib/constant.less
index 81835ff8ba..2ff6e6e60e 100644
--- a/src/less/lib/constant.less
+++ b/src/less/lib/constant.less
@@ -6,6 +6,7 @@
 @font-size-12: 12px;
 @font-size-13: 13px;
 @font-size-14: 14px;
+@font-size-15: 15px;
 @font-size-16: 16px;
 @font-size-18: 18px;
 @font-size-22: 22px;