diff --git a/src/components/ha-icon-check.html b/src/components/ha-icon-check.html
index 6bbf2cf068..3a4a53ab8a 100644
--- a/src/components/ha-icon-check.html
+++ b/src/components/ha-icon-check.html
@@ -16,7 +16,7 @@
         color: var(--google-red-500);
       }
 
-      [hidden]: {
+      [hidden] {
         display: none;
       }
     </style>