diff --git a/compile_server/app/checker.py b/compile_server/app/checker.py
index 559001d..310a338 100644
--- a/compile_server/app/checker.py
+++ b/compile_server/app/checker.py
@@ -221,6 +221,10 @@ def run_program(request):
     try:
         subprocess.check_call(["lxc", "file", "push", "--recursive", tempd,
                                "safecontainer/workspace/sessions/"])
+        subprocess.check_call(["lxc", "exec", "safecontainer", "--",
+                               "chown", "-R", "runner",
+                               "/workspace/sessions/{}".format
+                               (os.path.basename(tempd))])
         subprocess.check_call(["lxc", "exec", "safecontainer", "--",
                                "chmod", "-R", "a+rx",
                                "/workspace/sessions/{}".format