diff --git a/examples/react/next-server-actions/src/app/action.ts b/examples/react/next-server-actions/src/app/action.ts
index 8ffa3fc020..be1bf932da 100644
--- a/examples/react/next-server-actions/src/app/action.ts
+++ b/examples/react/next-server-actions/src/app/action.ts
@@ -25,7 +25,7 @@ export default async function someAction(prev: unknown, formData: FormData) {
     //   VALUES (${validatedData.name}, ${validatedData.email}, ${validatedData.password})
     // `
   } catch (e) {
-    if (e instanceof ServerValidateError) {
+    if (serverValidate.isFormError(e)) {
       return e.formState
     }
 
diff --git a/packages/react-form/src/nextjs/createServerValidate.ts b/packages/react-form/src/nextjs/createServerValidate.ts
index 903a6f5203..c48ac1bfcb 100644
--- a/packages/react-form/src/nextjs/createServerValidate.ts
+++ b/packages/react-form/src/nextjs/createServerValidate.ts
@@ -44,37 +44,39 @@ interface CreateServerValidateOptions<
   onServerValidate: TOnServer
 }
 
-export const createServerValidate =
-  <
+export const createServerValidate = <
+  TFormData,
+  TOnMount extends undefined | FormValidateOrFn<TFormData>,
+  TOnChange extends undefined | FormValidateOrFn<TFormData>,
+  TOnChangeAsync extends undefined | FormAsyncValidateOrFn<TFormData>,
+  TOnBlur extends undefined | FormValidateOrFn<TFormData>,
+  TOnBlurAsync extends undefined | FormAsyncValidateOrFn<TFormData>,
+  TOnSubmit extends undefined | FormValidateOrFn<TFormData>,
+  TOnSubmitAsync extends undefined | FormAsyncValidateOrFn<TFormData>,
+  TOnDynamic extends undefined | FormValidateOrFn<TFormData>,
+  TOnDynamicAsync extends undefined | FormAsyncValidateOrFn<TFormData>,
+  TOnServer extends undefined | FormAsyncValidateOrFn<TFormData>,
+  TSubmitMeta,
+>(
+  defaultOpts: CreateServerValidateOptions<
     TFormData,
-    TOnMount extends undefined | FormValidateOrFn<TFormData>,
-    TOnChange extends undefined | FormValidateOrFn<TFormData>,
-    TOnChangeAsync extends undefined | FormAsyncValidateOrFn<TFormData>,
-    TOnBlur extends undefined | FormValidateOrFn<TFormData>,
-    TOnBlurAsync extends undefined | FormAsyncValidateOrFn<TFormData>,
-    TOnSubmit extends undefined | FormValidateOrFn<TFormData>,
-    TOnSubmitAsync extends undefined | FormAsyncValidateOrFn<TFormData>,
-    TOnDynamic extends undefined | FormValidateOrFn<TFormData>,
-    TOnDynamicAsync extends undefined | FormAsyncValidateOrFn<TFormData>,
-    TOnServer extends undefined | FormAsyncValidateOrFn<TFormData>,
-    TSubmitMeta,
-  >(
-    defaultOpts: CreateServerValidateOptions<
-      TFormData,
-      TOnMount,
-      TOnChange,
-      TOnChangeAsync,
-      TOnBlur,
-      TOnBlurAsync,
-      TOnSubmit,
-      TOnSubmitAsync,
-      TOnDynamic,
-      TOnDynamicAsync,
-      TOnServer,
-      TSubmitMeta
-    >,
-  ) =>
-  async (formData: FormData, info?: Parameters<typeof decode>[1]) => {
+    TOnMount,
+    TOnChange,
+    TOnChangeAsync,
+    TOnBlur,
+    TOnBlurAsync,
+    TOnSubmit,
+    TOnSubmitAsync,
+    TOnDynamic,
+    TOnDynamicAsync,
+    TOnServer,
+    TSubmitMeta
+  >,
+) => {
+  const validateFn = async (
+    formData: FormData,
+    info?: Parameters<typeof decode>[1],
+  ) => {
     const { onServerValidate } = defaultOpts
 
     const runValidator = async ({
@@ -125,6 +127,17 @@ export const createServerValidate =
     })
   }
 
+  function isFormError(
+    e: unknown,
+  ): e is ServerValidateError<TFormData, TOnServer> {
+    return e instanceof ServerValidateError
+  }
+
+  return Object.assign(validateFn, {
+    isFormError,
+  })
+}
+
 export const initialFormState: ServerFormState<any, undefined> = {
   errorMap: {
     onServer: undefined,