diff --git a/pkg/actions/lua/lakefs/catalogexport/delta_exporter.lua b/pkg/actions/lua/lakefs/catalogexport/delta_exporter.lua
index aa378c6ba96..4c9fadd1e72 100644
--- a/pkg/actions/lua/lakefs/catalogexport/delta_exporter.lua
+++ b/pkg/actions/lua/lakefs/catalogexport/delta_exporter.lua
@@ -4,6 +4,14 @@ local pathlib = require("path")
 local json = require("encoding/json")
 local utils = require("lakefs/catalogexport/internal")
 
+--[[
+    delta_log_entry_key_generator returns a closure that returns a Delta Lake version key according to the Delta Lake
+    protocol: https://github.com/delta-io/delta/blob/master/PROTOCOL.md#delta-log-entries
+    Example:
+        local gen = delta_log_entry_key_generator()
+        gen() -- 000000000000000001.json
+        gen() -- 000000000000000002.json
+]]
 local function delta_log_entry_key_generator()
     local current = 0
     return function()
@@ -14,7 +22,7 @@ local function delta_log_entry_key_generator()
         for _ = 1, padding_length do
             padded_key = padded_key .. "0"
         end
-        padded_key = padded_key .. key
+        padded_key = padded_key .. key .. ".json"
         current = current + 1
         return padded_key
     end
@@ -93,7 +101,7 @@ local function export_delta_log(action, table_paths, storage_client, delta)
                 local entry_m = json.marshal(entry)
                 table.insert(entry_log, entry_m)
             end
-            table_log[string.format("%s.json", keyGenerator())] = entry_log
+            table_log[keyGenerator()] = entry_log
         end
 
         -- Get the table delta log physical location