diff --git a/judge/client.py b/judge/client.py
index da871c2..ac6309d 100644
--- a/judge/client.py
+++ b/judge/client.py
@@ -91,7 +91,8 @@ class JudgeClient(object):
                                 out_file=os.path.join(self._judge_base_path, str(test_case_id) + ".out"),
                                 args=execute_command[1:],
                                 env=["PATH=" + os.environ["PATH"]],
-                                use_sandbox=self._language["use_sandbox"])
+                                use_sandbox=self._language["use_sandbox"],
+                                use_nobody=True)
         if run_result["flag"] == 0:
             output_md5, r = self._compare_output(test_case_id)
             if r:
diff --git a/judge/compiler.py b/judge/compiler.py
index f39a62d..f4fc955 100644
--- a/judge/compiler.py
+++ b/judge/compiler.py
@@ -20,7 +20,8 @@ def compile_(language_item, src_path, exe_path, judge_base_path):
                                 max_memory=2000000000,
                                 args=compile_args,
                                 env=["PATH=" + os.environ["PATH"]],
-                                use_sandbox=False)
+                                use_sandbox=False,
+                                use_nobody=True)
 
     compile_output_handler = open(compiler_output_file)
     compile_output = compile_output_handler.read().strip()