diff --git a/src/StorageCache.h b/src/StorageCache.h
index a430572af..429795eb8 100644
--- a/src/StorageCache.h
+++ b/src/StorageCache.h
@@ -32,7 +32,7 @@ public:
         StorageCache *cache = new StorageCache(nullptr);
         if (pfactory->FSlow())
         {
-            cache->m_setkeys = std::make_unique<semiorderedset<sdsimmutablestring, sdsview, true>>();
+            cache->m_setkeys = std::make_unique<semiorderedset<sdsimmutablestring, sdsview, true>>(20);
         }
         load_iter_data data = {cache, fn, privdata};
         cache->m_spstorage = std::shared_ptr<IStorage>(pfactory->create(db, key_load_itr, (void*)&data));
diff --git a/src/semiorderedset.h b/src/semiorderedset.h
index 1b79e725b..c0281c35c 100644
--- a/src/semiorderedset.h
+++ b/src/semiorderedset.h
@@ -49,8 +49,11 @@ class semiorderedset
     }
 
 public:
-    semiorderedset()
+    semiorderedset(size_t bitsStart = 0)
     {
+        if (bitsStart < bits_min)
+            bitsStart = bits_min;
+        bits = bitsStart;
         m_data.resize((1ULL << bits));
     }