diff --git a/biome.json b/biome.json
index 04d7ebc625d..0ac296222f9 100644
--- a/biome.json
+++ b/biome.json
@@ -53,6 +53,7 @@
       "correctness": {
         "noInnerDeclarations": "error",
         "noUnusedImports": "error",
+        "noUnusedVariables": "error",
         "useExhaustiveDependencies": "off",
         "useHookAtTopLevel": "info"
       },
diff --git a/frontend/src/plugins/impl/data-frames/DataFramePlugin.tsx b/frontend/src/plugins/impl/data-frames/DataFramePlugin.tsx
index 0945b839022..50e97ccb61a 100644
--- a/frontend/src/plugins/impl/data-frames/DataFramePlugin.tsx
+++ b/frontend/src/plugins/impl/data-frames/DataFramePlugin.tsx
@@ -293,7 +293,3 @@ DataFrameComponent.displayName = "DataFrameComponent";
 function getColumnSummaries() {
   return Promise.resolve({ summaries: [], data: null });
 }
-
-function prettyNumber(value: number): string {
-  return new Intl.NumberFormat().format(value);
-}