diff --git a/mercury/src/internal/pack/cache.rs b/mercury/src/internal/pack/cache.rs
index 7a1a2e727..5b8b5cb9d 100644
--- a/mercury/src/internal/pack/cache.rs
+++ b/mercury/src/internal/pack/cache.rs
@@ -162,7 +162,9 @@ impl _Cache for Caches {
                 self.complete_signal.clone(),
                 Some(self.pool.clone()),
             );
-            a_obj.set_store_path(self.generate_temp_path(&self.tmp_path, hash));
+            if self.mem_size.is_some() {
+                a_obj.set_store_path(self.generate_temp_path(&self.tmp_path, hash));
+            }
             let _ = map.insert(hash, a_obj);
         }
         //order maters as for reading in 'get_by_offset()'