diff --git a/deployments/bridges/westend-millau/dashboard/grafana/relay-westend-to-millau-headers-dashboard.json b/deployments/bridges/westend-millau/dashboard/grafana/relay-westend-to-millau-headers-dashboard.json
index 6514f8e9e0..682ac2c778 100644
--- a/deployments/bridges/westend-millau/dashboard/grafana/relay-westend-to-millau-headers-dashboard.json
+++ b/deployments/bridges/westend-millau/dashboard/grafana/relay-westend-to-millau-headers-dashboard.json
@@ -237,7 +237,7 @@
       "steppedLine": false,
       "targets": [
         {
-          "expr": "max_over_time(Westend_to_Millau_Sync_best_source_block_numbers[10m])-min_over_time(Westend_to_Millau_Sync_best_source_block_number[10m])",
+          "expr": "max_over_time(Westend_to_Millau_Sync_best_source_block_number[10m])-min_over_time(Westend_to_Millau_Sync_best_source_block_number[10m])",
           "interval": "",
           "legendFormat": "Number of new Headers on Westend (Last 10 Mins)",
           "refId": "A"