diff --git a/packages/client/lib/commands/generic-transformers.ts b/packages/client/lib/commands/generic-transformers.ts
index 5048de9399a..ba0783d6158 100644
--- a/packages/client/lib/commands/generic-transformers.ts
+++ b/packages/client/lib/commands/generic-transformers.ts
@@ -404,7 +404,7 @@ export interface EvalOptions {
     arguments?: Array<string>;
 }
 
-export function evalFirstKeyIndex(options?: EvalOptions): string | undefined {
+export function evalFirstKeyIndex(_: unknown, options?: EvalOptions): string | undefined {
     return options?.keys?.[0];
 }