diff --git a/pmd-cpp/etc/grammar/cpp.jj b/pmd-cpp/etc/grammar/cpp.jj
index a39effe982..59eb1b51c6 100644
--- a/pmd-cpp/etc/grammar/cpp.jj
+++ b/pmd-cpp/etc/grammar/cpp.jj
@@ -312,7 +312,9 @@ TOKEN :
 
   <  CHARACTER : ("L")? "'" ( ( ~["'","\\","\r","\n"] ) | ( "\\" ( ~["\n","\r"] ) ) )* "'" >
 
-| <  STRING : ("L")? "\"" ( ( ~["\"","\\","\r","\n"] ) | ( "\\" ( ~["\n","\r"] | "\n" | "\r\n" ) ) )* "\"" >
+| < #STRPREF : (["L", "u", "U"] | "u8")? >
+| <  STRING : <STRPREF>
+      "\"" ( ( ~["\"","\\","\r","\n"] ) | ( "\\" ( ~["\n","\r"] | "\n" | "\r\n" ) ) )* "\"" >
 
 | <  RSTRING : "R\"(" ( ~[")"] | ( ")" ~["\""] ) )* ")\"" >
 }