diff --git a/Packages/Manual_tools/src/latex_converter_config/html/cc_anchor_header b/Packages/Manual_tools/src/latex_converter_config/html/cc_anchor_header
index cdadf172bcd..e3771a9fefb 100644
--- a/Packages/Manual_tools/src/latex_converter_config/html/cc_anchor_header
+++ b/Packages/Manual_tools/src/latex_converter_config/html/cc_anchor_header
@@ -47,6 +47,7 @@ letter          [a-zA-Z]
 noletter        [^a-zA-Z]
 digit           [0-9]
 CCletter        [a-zA-Z_]
+noCCchar        [^a-zA-Z0-9_]
 word            {letter}+
 CCidfier        ({CCletter}({CCletter}|{digit})*)
 ws              [ \t\n\r]*