diff --git a/anki/importing/csvfile.py b/anki/importing/csvfile.py
index 9ba65dfe0..d091e94af 100644
--- a/anki/importing/csvfile.py
+++ b/anki/importing/csvfile.py
@@ -112,6 +112,7 @@ class TextImporter(NoteImporter):
             self.numFields = len(reader.next())
         except:
             err()
+        self.initMapping()
 
     def fields(self):
         "Number of fields."