diff --git a/src/components/Theme/@types/component.ts b/src/components/Theme/@types/component.ts
index 325faed0..94e8eb7e 100644
--- a/src/components/Theme/@types/component.ts
+++ b/src/components/Theme/@types/component.ts
@@ -50,5 +50,5 @@ export interface Theme {
 export interface CustomTheme {
   colour?: Partial<Colour>;
   font?: Partial<CustomFont>;
-  [customProperty: string]: unknown;
+  [key: string]: unknown;
 }