diff --git a/src/lib/watchers/bma/head-watcher.ts b/src/lib/watchers/bma/head-watcher.ts
index fbff53f..e7ac121 100644
--- a/src/lib/watchers/bma/head-watcher.ts
+++ b/src/lib/watchers/bma/head-watcher.ts
@@ -4,7 +4,7 @@ import {WS2PHead} from "duniter/app/modules/ws2p/lib/WS2PCluster";
 
 function handleLateness(confHead: ConfHead, mainHeads: HeadMetric[], observedHead?: TrameWS2P): UrlWatcherResult {
   if (!mainHeads.length) {
-    return UrlWatcherResult.ko('Observed pubkey ${confHead.observedPubkey}: no consensus found')
+    return UrlWatcherResult.ko(`Observed pubkey ${confHead.observedPubkey}: no consensus found`)
   }
   if (!observedHead) {
     return UrlWatcherResult.ko(`Observed pubkey ${confHead.observedPubkey} not found in heads`)