diff --git a/scripts/add_copyright.py b/scripts/add_copyright.py
index 0c5b8f0..a9d4929 100755
--- a/scripts/add_copyright.py
+++ b/scripts/add_copyright.py
@@ -71,7 +71,7 @@
                 content = fd.read()
                 _, extension = os.path.splitext(f)
 
-                if extension in ['.cpp', '.h', '.inl', '.cl']:
+                if extension in ['.cpp', '.h', '.hpp', '.inl', '.cl']:
                     if not  content.startswith('/*'):
                         add_cpp_copyright(path, content)
                 elif extension == '.py' or f in ['SConstruct', 'SConscript']: