diff --git a/typings/preact/helpers.d.ts b/typings/preact/helpers.d.ts
index 9c9245fc..949f78a8 100644
--- a/typings/preact/helpers.d.ts
+++ b/typings/preact/helpers.d.ts
@@ -1,5 +1,7 @@
-type Diff<T extends string, U extends string> = ({[P in T]: P} &
-  {[P in U]: never} & {[x: string]: never})[T]
+type Diff<
+  T extends string | number | symbol,
+  U extends string | number | symbol
+> = ({[P in T]: P} & {[P in U]: never} & {[x: string]: never})[T]
 
 export type Omit<T, K extends keyof T> = Pick<T, Diff<keyof T, K>>