diff --git a/tailbone/app.py b/tailbone/app.py
index 8fe76c6e..69c42794 100644
--- a/tailbone/app.py
+++ b/tailbone/app.py
@@ -63,8 +63,9 @@ def make_rattail_config(settings):
 
     # configure database sessions
     tailbone.db.Session.configure(bind=rattail_config.rattail_engine)
-    tailbone.db.TempmonSession.configure(bind=rattail_config.tempmon_engine)
     tailbone.db.TrainwreckSession.configure(bind=rattail_config.trainwreck_engine)
+    if hasattr(rattail_config, 'tempmon_engine'):
+        tailbone.db.TempmonSession.configure(bind=rattail_config.tempmon_engine)
 
     # Make sure rattail config object uses our scoped session, to avoid
     # unnecessary connections (and pooling limits).