diff --git a/packages/better-auth/src/api/routes/sign-up.ts b/packages/better-auth/src/api/routes/sign-up.ts
index 27f1052059..8783857487 100644
--- a/packages/better-auth/src/api/routes/sign-up.ts
+++ b/packages/better-auth/src/api/routes/sign-up.ts
@@ -31,7 +31,7 @@ export const signUpEmail = <O extends BetterAuthOptions>() =>
 			method: "POST",
 			operationId: "signUpWithEmailAndPassword",
 			use: [formCsrfMiddleware],
-			body: z.record(z.string(), z.any()),
+			body: signUpEmailBodySchema,
 			metadata: {
 				allowedMediaTypes: [
 					"application/x-www-form-urlencoded",