diff --git a/sandbox.lua b/sandbox.lua
index ce345f8..6b5edd1 100644
--- a/sandbox.lua
+++ b/sandbox.lua
@@ -161,7 +161,9 @@ function sandbox.protect(code, options)
       sethook(timeout, "", quota)
     end
 
-    string.rep = nil -- luacheck: no global
+    if not options.allow_string_rep then
+      string.rep = nil -- luacheck: no global
+    end
 
     local t = table.pack(pcall(f, ...))