diff --git a/src/server/proxy-core/surfaces/openAiResponsesSurface.ts b/src/server/proxy-core/surfaces/openAiResponsesSurface.ts
index 3b82164..5cc24c9 100644
--- a/src/server/proxy-core/surfaces/openAiResponsesSurface.ts
+++ b/src/server/proxy-core/surfaces/openAiResponsesSurface.ts
@@ -138,7 +138,7 @@ function carriesResponsesFileUrlInput(value: unknown): boolean {
 function shouldRefreshOauthResponsesRequest(input: {
   oauthProvider?: string;
   status: number;
-  response: Response;
+  response: { headers: { get(name: string): string | null } };
   rawErrText: string;
 }): boolean {
   if (input.status === 401) return true;
diff --git a/src/server/routes/proxy/responsesWebsocket.ts b/src/server/routes/proxy/responsesWebsocket.ts
index de58de3..70531a0 100644
--- a/src/server/routes/proxy/responsesWebsocket.ts
+++ b/src/server/routes/proxy/responsesWebsocket.ts
@@ -341,7 +341,7 @@ async function forwardResponsesRequestViaHttp(input: {
   preserveIncrementalMode: boolean;
   authToken: string;
 }): Promise<unknown[] | null> {
-  const injectHeaders = {
+  const injectHeaders: Record<string, string | string[]> = {
     ...buildInjectHeaders(input.request),
     [RESPONSES_WEBSOCKET_TRANSPORT_HEADER]: '1',
     ...(input.preserveIncrementalMode ? { [RESPONSES_WEBSOCKET_MODE_HEADER]: 'incremental' } : {}),