diff --git a/module.d.ts b/module.d.ts
index 5a0ce17..f906b0b 100644
--- a/module.d.ts
+++ b/module.d.ts
@@ -6,7 +6,7 @@ declare module "activitypub-express" {
 // Only enough here for what I need.
 declare module "activitypub-http-signatures" {
     export class Sha256Signer {
-        constructor(options: { publicKeyId: string, privateKey: string }, headerNames?: string[]);
+        constructor(options: { publicKeyId: string, privateKey: string, headerNames?: string[] });
 
         sign: (options: { url: string, method: string, headers: any[] }) => string;
     };
diff --git a/src/net.ts b/src/net.ts
index f5b6e36..b11d5a0 100644
--- a/src/net.ts
+++ b/src/net.ts
@@ -45,8 +45,9 @@ export const signedFetch = async (url: string, init: RequestInit, signedInit: Si
 
     const signer = new Sha256Signer({
         privateKey: signedInit.privateKey,
-        publicKeyId: signedInit.keyId
-    }, headerNames);
+        publicKeyId: signedInit.keyId,
+        headerNames
+    });
 
     const signature = signer.sign({
         url,