diff --git a/src/borg/archive.py b/src/borg/archive.py
index 891a16222..8da51b22d 100644
--- a/src/borg/archive.py
+++ b/src/borg/archive.py
@@ -1056,8 +1056,11 @@ Duration: {0.duration}
             try:
                 self.cache.chunk_decref(id, size, stats, wait=False)
             except KeyError:
-                cid = bin_to_hex(id)
-                raise ChunksIndexError(cid)
+                nonlocal error
+                if forced == 0:
+                    cid = bin_to_hex(id)
+                    raise ChunksIndexError(cid)
+                error = True
             else:
                 fetch_async_response(wait=False)