diff --git a/packages/core-components/api-report.md b/packages/core-components/api-report.md
index 82d75fba96..c46b3637cb 100644
--- a/packages/core-components/api-report.md
+++ b/packages/core-components/api-report.md
@@ -807,7 +807,7 @@ export const ProxiedSignInPage: (
 // @public
 export type ProxiedSignInPageProps = SignInPageProps & {
   provider: string;
-  headers?: RefreshHeaders;
+  headers?: HeadersInit | (() => HeadersInit) | (() => Promise<HeadersInit>);
 };
 
 // Warning: (ae-missing-release-tag) "Ranker" is exported by the package, but it is missing a release tag (@alpha, @beta, @public, or @internal)
@@ -1533,5 +1533,4 @@ export type WarningPanelClassKey =
 // src/components/TabbedLayout/RoutedTabs.d.ts:9:5 - (ae-forgotten-export) The symbol "SubRoute" needs to be exported by the entry point index.d.ts
 // src/components/Table/Table.d.ts:20:5 - (ae-forgotten-export) The symbol "SelectedFilters" needs to be exported by the entry point index.d.ts
 // src/layout/ErrorBoundary/ErrorBoundary.d.ts:8:5 - (ae-forgotten-export) The symbol "SlackChannel" needs to be exported by the entry point index.d.ts
-// src/layout/ProxiedSignInPage/ProxiedSignInPage.d.ts:19:5 - (ae-forgotten-export) The symbol "RefreshHeaders" needs to be exported by the entry point index.d.ts
 ```
diff --git a/packages/core-components/src/layout/ProxiedSignInPage/ProxiedSignInIdentity.ts b/packages/core-components/src/layout/ProxiedSignInPage/ProxiedSignInIdentity.ts
index 828e9ab1a0..bd1fc1bf39 100644
--- a/packages/core-components/src/layout/ProxiedSignInPage/ProxiedSignInIdentity.ts
+++ b/packages/core-components/src/layout/ProxiedSignInPage/ProxiedSignInIdentity.ts
@@ -48,15 +48,10 @@ export function tokenToExpiry(jwtToken: string | undefined): Date {
   return new Date(payload.exp * 1000 - DEFAULTS.tokenExpiryMarginMillis);
 }
 
-export type RefreshHeaders =
-  | HeadersInit
-  | (() => HeadersInit)
-  | (() => Promise<HeadersInit>);
-
 type ProxiedSignInIdentityOptions = {
   provider: string;
   discoveryApi: typeof discoveryApiRef.T;
-  headers?: RefreshHeaders;
+  headers?: HeadersInit | (() => HeadersInit) | (() => Promise<HeadersInit>);
 };
 
 type State =
diff --git a/packages/core-components/src/layout/ProxiedSignInPage/ProxiedSignInPage.tsx b/packages/core-components/src/layout/ProxiedSignInPage/ProxiedSignInPage.tsx
index 9d91a31462..ea095cd8ab 100644
--- a/packages/core-components/src/layout/ProxiedSignInPage/ProxiedSignInPage.tsx
+++ b/packages/core-components/src/layout/ProxiedSignInPage/ProxiedSignInPage.tsx
@@ -23,7 +23,7 @@ import React from 'react';
 import { useAsync, useMountEffect } from '@react-hookz/web';
 import { ErrorPanel } from '../../components/ErrorPanel';
 import { Progress } from '../../components/Progress';
-import { ProxiedSignInIdentity, RefreshHeaders } from './ProxiedSignInIdentity';
+import { ProxiedSignInIdentity } from './ProxiedSignInIdentity';
 
 /**
  * Props for {@link ProxiedSignInPage}.
@@ -41,7 +41,7 @@ export type ProxiedSignInPageProps = SignInPageProps & {
    * Optional headers which are passed along with the request to the
    * underlying provider
    */
-  headers?: RefreshHeaders;
+  headers?: HeadersInit | (() => HeadersInit) | (() => Promise<HeadersInit>);
 };
 
 /**