diff --git a/common/lib/codejail/codejail/jailpy.py b/common/lib/codejail/codejail/jailpy.py
index ed13a0d3f0..c3e98a518a 100644
--- a/common/lib/codejail/codejail/jailpy.py
+++ b/common/lib/codejail/codejail/jailpy.py
@@ -3,6 +3,7 @@
 # Instructions:
 #   - AppArmor.md from xserver
 
+import logging
 import os, os.path
 import resource
 import shutil
@@ -13,6 +14,8 @@ import time
 
 from .util import temp_directory
 
+log = logging.getLogger(__name__)
+
 # TODO: limit too much stdout data?
 
 # Configure the Python command
@@ -61,6 +64,8 @@ def jailpy(code, files=None, argv=None, stdin=None):
 
     with temp_directory(delete_when_done=True) as tmpdir:
 
+        log.debug("Executing jailed code: %r", code)
+
         # All the supporting files are copied into our directory.
         for filename in files or ():
             if os.path.isfile(filename):