diff --git a/Scripts/developer_scripts/add_license_in_pkg_header.py b/Scripts/developer_scripts/add_license_in_pkg_header.py
index bd377232632..a093373654a 100644
--- a/Scripts/developer_scripts/add_license_in_pkg_header.py
+++ b/Scripts/developer_scripts/add_license_in_pkg_header.py
@@ -17,6 +17,12 @@ def add_license_include_in_file(package_name, fname):
     if any(re.search("#include\s*<CGAL/license/", line) for line in f):
       return # include directive already there
 
+  #match only file under a GPL license
+  with codecs.open(fname, encoding='utf-8') as f:
+    if not any(re.search("SPDX-License-Identifier:.*[ (]GPL", line) for line in f):
+      return # include directive already there
+
+
   # include directive not already there
   inserted = False
   with codecs.open(fname, encoding='utf-8') as f: