diff --git a/anki/db.py b/anki/db.py
index e65336da2..6fe6665b8 100644
--- a/anki/db.py
+++ b/anki/db.py
@@ -39,6 +39,17 @@ except ImportError:
     from sqlalchemy import Unicode
     UnicodeText = Unicode
 
+# dump location of non-unicode string
+from sqlalchemy import util
+import traceback
+oldWarn = util.warn
+def newWarn(*args, **kwargs):
+    traceback.print_stack()
+    oldWarn(*args, **kwargs)
+util.warn = newWarn
+
+
+
 metadata = MetaData()
 
 # this class assumes the provided session is called with transactional=False