diff --git a/gensim/test/test_corpora.py b/gensim/test/test_corpora.py
index 9d0d1c97f0..d9fe49ea69 100644
--- a/gensim/test/test_corpora.py
+++ b/gensim/test/test_corpora.py
@@ -168,6 +168,7 @@ def test_indexing(self):
 
         for idx, doc in enumerate(docs):
             self.assertEqual(doc, corpus[idx])
+            self.assertEqual(doc, corpus[np.int64(idx)])
 
         self.assertEqual(docs, list(corpus[:]))
         self.assertEqual(docs[0:], list(corpus[0:]))
diff --git a/gensim/test/test_doc2vec.py b/gensim/test/test_doc2vec.py
index 2119a15a91..e4367732e7 100644
--- a/gensim/test/test_doc2vec.py
+++ b/gensim/test/test_doc2vec.py
@@ -146,7 +146,7 @@ def test_similarity_unseen_docs(self):
     def model_sanity(self, model, keep_training=True):
         """Any non-trivial model on DocsLeeCorpus can pass these sanity checks"""
         fire1 = 0  # doc 0 sydney fires
-        fire2 = 8  # doc 8 sydney fires
+        fire2 = np.int64(8)  # doc 8 sydney fires
         tennis1 = 6  # doc 6 tennis
 
         # inferred vector should be top10 close to bulk-trained one