diff --git a/src/box/lua/schema.lua b/src/box/lua/schema.lua
index 9c9994c5b2360daa746c1bffb0f132feed4a2f58..3275f86352fd844d5bc5687a19cab3321915a7c5 100644
--- a/src/box/lua/schema.lua
+++ b/src/box/lua/schema.lua
@@ -289,7 +289,7 @@ end
 
 -- space format - the metadata about space fields
 function box.schema.space.format(id, format)
-    _space = box.space._space
+    local _space = box.space._space
     check_param(id, 'id', 'number')
     check_param(format, 'format', 'table')
     if format == nil then