diff --git a/app/api/submit/settings/route.ts b/app/api/submit/settings/route.ts
index 296df9b9..1ed685b2 100644
--- a/app/api/submit/settings/route.ts
+++ b/app/api/submit/settings/route.ts
@@ -87,7 +87,7 @@ function folderIdFor(
   kind: "photo" | "screen" | "notes"
 ): string | undefined {
   const E = process.env;
-  const map = {
+  const map: Record<Target, { photo?: string; screen?: string; notes?: string }> = {
     settings_co2gal: {
       photo: E.DX_FOLDER_GALVO_PHOTOS,
       screen: E.DX_FOLDER_GALVO_SCREENS,
@@ -108,8 +108,7 @@ function folderIdFor(
       screen: E.DX_FOLDER_UV_SCREENS,
       notes: E.DX_FOLDER_UV_NOTES,
     },
-  } as const;
-  // @ts-expect-error narrow map index
+  };
   return map[target]?.[kind];
 }