diff --git a/packages/next/src/server/lib/revalidate.ts b/packages/next/src/server/lib/revalidate.ts
index 23d9129d21146..7d97f37650b7e 100644
--- a/packages/next/src/server/lib/revalidate.ts
+++ b/packages/next/src/server/lib/revalidate.ts
@@ -17,9 +17,10 @@ export function formatRevalidate({
   revalidate: Revalidate
   swrDelta?: SwrDelta
 }): string {
-  const swrHeader = swrDelta
-    ? `stale-while-revalidate=${swrDelta}`
-    : 'stale-while-revalidate'
+  const swrHeader =
+    swrDelta === undefined
+      ? `stale-while-revalidate=${CACHE_ONE_YEAR}`
+      : `stale-while-revalidate=${swrDelta}`
 
   if (revalidate === 0) {
     return 'private, no-cache, no-store, max-age=0, must-revalidate'