diff --git a/src/components/Theme/@types/component.ts b/src/components/Theme/@types/component.ts
index de6b4631..c9fd9eeb 100644
--- a/src/components/Theme/@types/component.ts
+++ b/src/components/Theme/@types/component.ts
@@ -50,5 +50,4 @@ export interface Theme {
 export interface CustomTheme {
   colour?: Partial<Colour>;
   font?: Partial<CustomFont>;
-  customProperties?: unknown;
-}
\ No newline at end of file
+  [customProperty: string]: unknown;}
\ No newline at end of file