diff --git a/anki/facts.py b/anki/facts.py
index 11f7e204c..eb0c02e81 100644
--- a/anki/facts.py
+++ b/anki/facts.py
@@ -81,7 +81,7 @@ class Fact(object):
         try:
             return [f.value for f in self.fields if f.name == key][0]
         except IndexError:
-            raise KeyError
+            raise KeyError(key)
 
     def __setitem__(self, key, value):
         try: