diff --git a/check_source/check_spelling_c_config.py b/check_source/check_spelling_c_config.py
index c4cdfc5f32f01c1fc7d5808b54e9e7aadb66153e..1a70326b9ee2a8bb47d6358f19b62715f2fc4668 100644
--- a/check_source/check_spelling_c_config.py
+++ b/check_source/check_spelling_c_config.py
@@ -79,6 +79,7 @@ dict_custom = {
     "overridable",
     "paddings",
     "parameterization",
+    "parentless",
     "polytope",
     "postprocessed",
     "precalculate",