diff --git a/packages/better-auth/src/types/helper.ts b/packages/better-auth/src/types/helper.ts
index ca9e22f438..c7aeb6f8f5 100644
--- a/packages/better-auth/src/types/helper.ts
+++ b/packages/better-auth/src/types/helper.ts
@@ -55,3 +55,4 @@ export type DeepPartial<T> = T extends Function
 	: T extends object
 		? { [K in keyof T]?: DeepPartial<T[K]> }
 		: T;
+export type Expand<T> = T extends infer O ? { [K in keyof O]: O[K] } : never;