diff --git a/tests/pipeline/test_adjustment.py b/tests/pipeline/test_adjustment.py
index 73fa2546..d5c99c0e 100644
--- a/tests/pipeline/test_adjustment.py
+++ b/tests/pipeline/test_adjustment.py
@@ -65,6 +65,6 @@ class AdjustmentTestCase(TestCase):
         exc = e.exception
         expected_msg = (
             "Don't know how to make overwrite adjustments for values of type "
-            "<class 'tests.pipeline.test_adjustment.SomeClass'>."
+            "%r." % SomeClass
         )
         self.assertEqual(str(exc), expected_msg)
diff --git a/zipline/lib/adjustment.pyx b/zipline/lib/adjustment.pyx
index 8bdeee00..9d1a7c2f 100644
--- a/zipline/lib/adjustment.pyx
+++ b/zipline/lib/adjustment.pyx
@@ -51,11 +51,11 @@ cpdef choose_adjustment_type(int adjustment_kind, object value):
     if adjustment_kind in (ADD, MULTIPLY):
         if not _is_float(value):
             raise TypeError(
-                "Can't construct %s Adjustment with value of type %s.\n"
+                "Can't construct %s Adjustment with value of type %r.\n"
                 "ADD and MULTIPLY adjustments are only supported for "
                 "floating point data." % (
                     ADJUSTMENT_KIND_NAMES[adjustment_kind],
-                    type(value).__name__,
+                    type(value),
                 )
             )
         return _float_adjustment_types[adjustment_kind]
@@ -68,7 +68,7 @@ cpdef choose_adjustment_type(int adjustment_kind, object value):
         else:
             raise TypeError(
                 "Don't know how to make overwrite "
-                "adjustments for values of type %s." % type(value),
+                "adjustments for values of type %r." % type(value),
             )
     else:
         raise ValueError("Unknown adjustment type %d." % adjustment_kind)