--- syntax/Syntax
+++ syntax/Syntax
@@ -79,7 +79,7 @@
 file ..\*\\.c$ C\sProgram
 include c.syntax
 
-file ..\*\\.([hC]|CC|cxx|cc|cpp|CPP|CXX|hxx|h\.in)$ C/C\+\+\sProgram
+file ..\*\\.([hC]|CC|cxx|cc|cpp|CPP|CXX|hxx|hpp|HPP|h\.in)$ C/C\+\+\sProgram
 include cxx.syntax
 
 file ..\*\\.d$ D\sProgram