diff --git a/src/serviceworker/index.ts b/src/serviceworker/index.ts
index 314de4432f..25942bd3a5 100644
--- a/src/serviceworker/index.ts
+++ b/src/serviceworker/index.ts
@@ -91,11 +91,13 @@ self.addEventListener("fetch", (event: FetchEvent) => {
             // Add authentication and send the request. We add authentication even if MSC3916 endpoints aren't
             // being used to ensure patches like this work:
             // https://github.com/matrix-org/synapse/commit/2390b66bf0ec3ff5ffb0c7333f3c9b239eeb92bb
-            const config = !accessToken ? undefined : {
-                headers: {
-                    Authorization: `Bearer ${accessToken}`,
-                },
-            };
+            const config = !accessToken
+                ? undefined
+                : {
+                      headers: {
+                          Authorization: `Bearer ${accessToken}`,
+                      },
+                  };
             return fetch(url, config);
         })(),
     );
@@ -107,11 +109,13 @@ async function tryUpdateServerSupportMap(clientApiUrl: string, accessToken?: str
         return; // up to date
     }
 
-    const config = !accessToken ? undefined : {
-        headers: {
-            Authorization: `Bearer ${accessToken}`,
-        },
-    };
+    const config = !accessToken
+        ? undefined
+        : {
+              headers: {
+                  Authorization: `Bearer ${accessToken}`,
+              },
+          };
     const versions = await (await fetch(`${clientApiUrl}/_matrix/client/versions`, config)).json();
 
     serverSupportMap[clientApiUrl] = {