diff --git a/index.ts b/index.ts
index 7a4ac31..85517c0 100644
--- a/index.ts
+++ b/index.ts
@@ -136,11 +136,10 @@ async function setupSnapshotServer(
         if (magic) {
           const hash = createHash("md5").update(magic).digest("hex");
           const index = parseInt(hash.substring(0, 8), 16) % files.length;
-          // Cache until the next hour rolls over
           res.sendFile(files[index], {
             headers: {
               "Cache-Control": `public, max-age=${
-                3600 - new Date().getMinutes() * 60
+                3600 - new Date().getMinutes() * 60 - new Date().getSeconds()
               }`,
             },
             root: currentDir,