diff --git a/packages/mosaic/framework/tools/wake/detector.sh b/packages/mosaic/framework/tools/wake/detector.sh
index 2c064eaa..7bd8abce 100755
--- a/packages/mosaic/framework/tools/wake/detector.sh
+++ b/packages/mosaic/framework/tools/wake/detector.sh
@@ -529,7 +529,7 @@ cmd_run() {
         echo "detector.sh: WARN — off-host liveness beacon emit failed (see beacon.sh); the off-host absence check remains the authoritative dead-man." >&2
     fi
     [ "$once" -eq 1 ] && break
-    sleep "$interval"
+    sleep "$interval" 9>&-
   done
 }