diff --git a/spacy/attrs.pyx b/spacy/attrs.pyx
index ddcbdff64..81554ecd3 100644
--- a/spacy/attrs.pyx
+++ b/spacy/attrs.pyx
@@ -124,10 +124,15 @@ def intify_attrs(stringy_attrs, strings_map=None, _do_deprecated=False):
             'PunctType', 'PunctSide', 'Other', 'Degree', 'AdvType', 'Number',
             'VerbForm', 'PronType', 'Aspect', 'Tense', 'PartType', 'Poss',
             'Hyph', 'ConjType', 'NumType', 'Foreign', 'VerbType', 'NounType',
-            'Number', 'PronType', 'AdjType', 'Person']
+            'Number', 'PronType', 'AdjType', 'Person', 'Variant', 'AdpType',
+            'Reflex', 'Negative', 'Mood', 'Aspect', 'Case']
         for key in morph_keys:
             if key in stringy_attrs:
                 stringy_attrs.pop(key)
+            elif key.lower() in stringy_attrs:
+                stringy_attrs.pop(key.lower())
+            elif key.upper() in stringy_attrs:
+                stringy_attrs.pop(key.upper())
     for name, value in stringy_attrs.items():
         if isinstance(name, int):
             int_key = name