diff --git a/packages/ui/src/app/utils/web-api.ts b/packages/ui/src/app/utils/web-api.ts
index 2d620a35..ec4a8927 100644
--- a/packages/ui/src/app/utils/web-api.ts
+++ b/packages/ui/src/app/utils/web-api.ts
@@ -84,7 +84,9 @@ export function fixMobileSafariActiveTransition(): void {
 }
 
 export function defineStylesRoot(): void {
-    customElements.define(globalStylesTag, class TcRootElement extends HTMLElement {});
+    if (!customElements.get(globalStylesTag)) {
+        customElements.define(globalStylesTag, class TcRootElement extends HTMLElement {});
+    }
 }
 
 /**