diff --git a/web/src/app.d.ts b/web/src/app.d.ts
index 7ca210845..86364211e 100644
--- a/web/src/app.d.ts
+++ b/web/src/app.d.ts
@@ -9,6 +9,13 @@ declare global {
 				camoEnabled: boolean;
 			};
 		}
+
+		interface Platform {
+			// worker service bindings, only present when running on Cloudflare
+			env?: {
+				BOBBIN?: { fetch(request: Request): Promise<Response> };
+			};
+		}
 	}
 }
 
diff --git a/web/src/hooks.server.ts b/web/src/hooks.server.ts
index cf28e96d4..3e430aab0 100644
--- a/web/src/hooks.server.ts
+++ b/web/src/hooks.server.ts
@@ -1,14 +1,10 @@
 import type { Handle } from "@sveltejs/kit";
 
-type BobbinService = {
-	fetch(request: Request): Promise<Response>;
-};
-
 export const handle: Handle = async ({ event, resolve }) => {
 	// Keep bobbin off the public network. In Cloudflare this is a Worker
 	// service binding; the browser only ever sees the web origin.
 	if (event.url.pathname === "/xrpc" || event.url.pathname.startsWith("/xrpc/")) {
-		const bobbin = (event.platform?.env as { BOBBIN?: BobbinService } | undefined)?.BOBBIN;
+		const bobbin = event.platform?.env?.BOBBIN;
 		if (bobbin) {
 			const upstream = new URL(event.request.url);
 			upstream.hostname = "bobbin.internal";