diff --git a/.changeset/few-snails-mate.md b/.changeset/few-snails-mate.md
new file mode 100644
index 00000000..c25d4056
--- /dev/null
+++ b/.changeset/few-snails-mate.md
@@ -0,0 +1,5 @@
+---
+"vinxi": patch
+---
+
+fix: add partial for setResponseHeaders
diff --git a/packages/vinxi/runtime/http-types.d.ts b/packages/vinxi/runtime/http-types.d.ts
index dfd73ad0..bcbc5099 100644
--- a/packages/vinxi/runtime/http-types.d.ts
+++ b/packages/vinxi/runtime/http-types.d.ts
@@ -625,10 +625,10 @@ export function getResponseHeader(
 
 export function setResponseHeaders(
 	event: HTTPEvent,
-	headers: Record<HTTPHeaderName, Parameters<OutgoingMessage["setHeader"]>[1]>,
+	headers: Partial<Record<HTTPHeaderName, Parameters<OutgoingMessage["setHeader"]>[1]>>,
 ): void;
 export function setResponseHeaders(
-	headers: Record<HTTPHeaderName, Parameters<OutgoingMessage["setHeader"]>[1]>,
+	headers: Partial<Record<HTTPHeaderName, Parameters<OutgoingMessage["setHeader"]>[1]>>,
 ): void;
 
 export const setHeaders: typeof setResponseHeaders;