diff --git a/src/lib/stores/index.ts b/src/lib/stores/index.ts
index 7e0651994f..1d4b87eecf 100644
--- a/src/lib/stores/index.ts
+++ b/src/lib/stores/index.ts
@@ -247,7 +247,7 @@ type Settings = {
 	autoTags?: boolean;
 	autoFollowUps?: boolean;
 	splitLargeChunks?(body: any, splitLargeChunks: any): unknown;
-	backgroundImageUrl?: null;
+	backgroundImageUrl?: string | null;
 	landingPageMode?: string;
 	iframeSandboxAllowScripts?: boolean;
 	iframeSandboxAllowForms?: boolean;