diff --git a/spacy/morphology.pyx b/spacy/morphology.pyx
index 2f3e8d1fa..cead0756b 100644
--- a/spacy/morphology.pyx
+++ b/spacy/morphology.pyx
@@ -111,7 +111,7 @@ def get_field_size(field):
 
 
 def get_field_offset(field):
-    return FIELD_OFFSETS[FIELDS[]]]]field]
+    return FIELD_OFFSETS[FIELDS[field]]
 
 
 cdef class Morphology: