diff --git a/Lib/tokenize.py b/Lib/tokenize.py
index a30791c..a9be4cf 100644
--- a/Lib/tokenize.py
+++ b/Lib/tokenize.py
@@ -273,7 +273,8 @@
             while column < indents[-1]:
                 if column not in indents:
                     raise IndentationError(
-                        "unindent does not match any outer indentation level")
+                        "unindent does not match any outer indentation level",
+                        ("<tokenize>", lnum, pos, line))
                 indents = indents[:-1]
                 yield (DEDENT, '', (lnum, pos), (lnum, pos), line)