diff --git a/perftest.lua b/perftest.lua
index 13502e7..18af231 100755
--- a/perftest.lua
+++ b/perftest.lua
@@ -1,14 +1,18 @@
 #!/usr/bin/env tarantool
 
-local t = require('luatest')
-
-local checks = require('checks')
 local json = require('json')
 local log = require('log')
 local uuid = require('uuid')
 
+local t = require('luatest')
+
 local g = t.group('checks_performance')
 
+-- Clean up built-in checks to run tests with repository module.
+package.preload['checks'] = nil
+package.loaded['checks'] = nil
+local checks = require('checks')
+
 local args = {
     ['nil'] = nil,
     ['string'] = 'str',
diff --git a/test.lua b/test.lua
index 151278f..c726796 100755
--- a/test.lua
+++ b/test.lua
@@ -1,12 +1,16 @@
 #!/usr/bin/env tarantool
 
-local t = require('luatest')
-
 local json = require('json')
-local checks = require('checks')
+
+local t = require('luatest')
 
 local g = t.group('checks')
 
+-- Clean up built-in checks to run tests with repository module.
+package.preload['checks'] = nil
+package.loaded['checks'] = nil
+local checks = require('checks')
+
 ------------------------------------------------------------------------------
 local current_file = debug.getinfo(1, 'S').short_src