diff --git a/src/currency_core/blockchain_storage.cpp b/src/currency_core/blockchain_storage.cpp
index 0d6d41f8..32a8e9a9 100644
--- a/src/currency_core/blockchain_storage.cpp
+++ b/src/currency_core/blockchain_storage.cpp
@@ -76,8 +76,8 @@ DISABLE_VS_WARNINGS(4267)
 
 namespace 
 {
-  const command_line::arg_descriptor<uint32_t>      arg_db_cache_l1  ( "db-cache-l1", "Specify size of memory mapped db cache file");
-  const command_line::arg_descriptor<uint32_t>      arg_db_cache_l2  ( "db-cache-l2", "Specify cached elements in db helpers");
+  const command_line::arg_descriptor<uint64_t>      arg_db_cache_l1  ( "db-cache-l1", "Specify size of memory mapped db cache file");
+  const command_line::arg_descriptor<uint64_t>      arg_db_cache_l2  ( "db-cache-l2", "Specify cached elements in db helpers");
 }
 
 //------------------------------------------------------------------