diff --git a/packages/astro/src/content/utils.ts b/packages/astro/src/content/utils.ts
index 3082f344f49c..f67a7ad63d5b 100644
--- a/packages/astro/src/content/utils.ts
+++ b/packages/astro/src/content/utils.ts
@@ -168,7 +168,7 @@ export async function getEntryDataAndImages<
 ): Promise<{ data: TOutputData; imageImports: Array<string> }> {
 	let data: TOutputData;
 	// Legacy content collections have 'slug' removed
-	if (collectionConfig.type === 'content') {
+	if (collectionConfig.type === 'content' || (collectionConfig as any)._legacy) {
 		const { slug, ...unvalidatedData } = entry.unvalidatedData;
 		data = unvalidatedData as TOutputData;
 	} else {