diff --git a/.changeset/gorgeous-beds-tickle.md b/.changeset/gorgeous-beds-tickle.md
new file mode 100644
index 000000000000..5be7b2c0d7d6
--- /dev/null
+++ b/.changeset/gorgeous-beds-tickle.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fix Invalid Input error when trying to use a custom Image Service
diff --git a/packages/astro/src/core/config/schema.ts b/packages/astro/src/core/config/schema.ts
index 5848222decb4..5c7a31909ad4 100644
--- a/packages/astro/src/core/config/schema.ts
+++ b/packages/astro/src/core/config/schema.ts
@@ -123,7 +123,7 @@ export const AstroConfigSchema = z.object({
 			service: z.union([
 				z.literal('astro/assets/services/sharp'),
 				z.literal('astro/assets/services/squoosh'),
-				z.string().and(z.object({})),
+				z.string(),
 			]),
 		})
 		.default({