diff --git a/src/content.config.ts b/src/content.config.ts
index 34c05b7b..e045c292 100644
--- a/src/content.config.ts
+++ b/src/content.config.ts
@@ -11,7 +11,7 @@ const postsCollection = defineCollection({
 		description: z.string().optional().default(""),
 		image: z.string().optional().default(""),
 		tags: z.array(z.string()).optional().default([]),
-		category: z.string().optional().default(""),
+		category: z.string().optional().nullable().default(""),
 		lang: z.string().optional().default(""),
 
 		/* For internal use */