diff --git a/spacy/kb.pxd b/spacy/kb.pxd
index 9d9a21a8c..3ba9c8bba 100644
--- a/spacy/kb.pxd
+++ b/spacy/kb.pxd
@@ -67,8 +67,8 @@ cdef class KnowledgeBase:
     # efficient.
     cdef object _aliases_table
 
-    cdef void c_add_entity(self, hash_t key, float prob, const int32_t* vector_rows,
-                    int feats_row) nogil:
+    cdef inline int64_t c_add_entity(self, hash_t key, float prob, const int32_t* vector_rows,
+                    int feats_row):
         """Add an entry to the knowledge base."""
         # This is what we'll map the hash key to. It's where the entry will sit
         # in the vector of entries, so we can get it later.
diff --git a/spacy/kb.pyx b/spacy/kb.pyx
index ce76f2fc4..46acc2967 100644
--- a/spacy/kb.pyx
+++ b/spacy/kb.pyx
@@ -11,17 +11,21 @@ cdef class KnowledgeBase:
             return
 
         cdef hash_t name_hash = hash_string(name)
-        self.c_add_entity(name_hash, prob, self._vectors_table.get_pointer(vectors),
-                   self._features_table.get(features))
+        cdef int32_t dummy_value = 342
+        self.c_add_entity(name_hash, prob, &dummy_value, dummy_value)
+        # TODO self._vectors_table.get_pointer(vectors),
+        #  self._features_table.get(features))
 
     def add_alias(self, alias, entities, probabilities):
         """For a given alias, add its potential entities and prior probabilies to the KB."""
         cdef hash_t alias_hash = hash_string(alias)
+        cdef hash_t entity_hash = 0
+        cdef int64_t entity_index = 0
 
         # TODO: check len(entities) == len(probabilities)
         for entity, prob in zip(entities, probabilities):
-            cdef hash_t entity_hash = hash_string(entity)
-            cdef int64_t entity_index = self._index[entity_hash]
+            entity_hash = hash_string(entity)
+            entity_index = self._index[entity_hash]
             # TODO: check that entity is already in this KB (entity_index is OK)
             self._aliases_table.add(alias_hash, entity_index, prob)