diff --git a/src/atomWithFormControls.ts b/src/atomWithFormControls.ts
index a3816b7..8547d8c 100644
--- a/src/atomWithFormControls.ts
+++ b/src/atomWithFormControls.ts
@@ -1,4 +1,4 @@
-import { WritableAtom, atom } from 'jotai/vanilla';
+import { atom, WritableAtom } from 'jotai/vanilla';
 import type {
   ExtractTypeOfValidatorValue,
   Validator,
@@ -19,7 +19,7 @@ export type ActionableNext = {
 export type FormControls<Keys extends string, Vals> = {
   isValid: boolean;
   fieldErrors: {
-    [k: string]: any;
+    [k in Keys]: string | Error | any;
   };
   touched: Record<Keys, boolean>;
   focused: Record<Keys, boolean>;
diff --git a/src/atomWithValidate.ts b/src/atomWithValidate.ts
index de9fc74..0e18930 100644
--- a/src/atomWithValidate.ts
+++ b/src/atomWithValidate.ts
@@ -1,5 +1,5 @@
 import { atom } from 'jotai/vanilla';
-import type { WritableAtom, SetStateAction } from 'jotai/vanilla';
+import type { SetStateAction, WritableAtom } from 'jotai/vanilla';
 
 export type CommonState<Value> = {
   value: Value;