diff --git a/help/help_mp-zh_CN.h.charset b/help/help_mp-zh_CN.h.charset
index 5546241a35..7edc66b06a 100644
--- a/help/help_mp-zh_CN.h.charset
+++ b/help/help_mp-zh_CN.h.charset
@@ -1 +1 @@
-utf8
+UTF-8