diff --git a/syntax/cpp.vim b/syntax/cpp.vim
index f5ce902..8c27371 100644
--- a/syntax/cpp.vim
+++ b/syntax/cpp.vim
@@ -65,7 +65,7 @@ if !exists('cpp_no_delimiters')
 
   " Match: nested namespace expressions: expr::
   "                                      ^^^^
-  syn match cppNestedName '\a\w*::' display contains=cppDelimiter
+  syn match cppNestedName '\w\+::' display contains=cppDelimiter
 
   " Match: label: as a Label and public: protected: private: as a Statement
   "        ^^^^^                 ^^^^^^  ^^^^^^^^^  ^^^^^^^