diff --git a/scripts/test_psa_constant_names.py b/scripts/test_psa_constant_names.py
index fb8b9a20b..c87923a12 100755
--- a/scripts/test_psa_constant_names.py
+++ b/scripts/test_psa_constant_names.py
@@ -172,8 +172,8 @@ def main():
         parser.add_argument('--include', '-I',
                             action='append', default=['tf-psa-crypto/include',
                                                       'tf-psa-crypto/drivers/builtin/include',
-                                                      'tf-psa-crypto/drivers/everest/include',
-                                                      'tf-psa-crypto/private/',
+                                                      'tf-psa-crypto/drivers/everest/include'
+                                                      'tf-psa-crypto/private',
                                                       'include'],
                             help='Directory for header files')
     parser.add_argument('--keep-c',