diff --git a/.stylelintrc.json b/.stylelintrc.json
index d65bf30..c3a595a 100644
--- a/.stylelintrc.json
+++ b/.stylelintrc.json
@@ -8,6 +8,7 @@
 		"custom-property-pattern": null,
 		"declaration-property-value-no-unknown": true,
 		"keyframes-name-pattern": null,
+		"no-unknown-custom-properties": true,
 		"selector-class-pattern": null,
 		"selector-id-pattern": null
 	}