diff --git a/src/lua/init.cc b/src/lua/init.cc
index 706252745735638faa5b52a5f2cbb2c4d8423375..2afcc14b3a136cdc67fbe3f546c3256dcf1e6ae0 100644
--- a/src/lua/init.cc
+++ b/src/lua/init.cc
@@ -1547,6 +1547,7 @@ tarantool_lua_sandbox(struct lua_State *L)
 					    "os.rename = nil\n"
 					    "os.tmpname = nil\n"
 					    "os.remove = nil\n"
+					    "io = nil\n"
 					    "require = nil\n");
 	if (result)
 		panic("%s", lua_tostring(L, -1));