diff --git a/zipline/pipeline/classifiers/classifier.py b/zipline/pipeline/classifiers/classifier.py
index f3c2e22c..de5da2f0 100644
--- a/zipline/pipeline/classifiers/classifier.py
+++ b/zipline/pipeline/classifiers/classifier.py
@@ -437,7 +437,7 @@ class Relabel(SingleInputMixin, Classifier):
             result = data.map(relabeler)
             result[~mask] = data.missing_value
         else:
-            raise TypeError(
+            raise NotImplementedError(
                 "Relabeling is not currently supported for "
                 "int-dtype classifiers."
             )