diff --git a/gensim/test/test_similarities.py b/gensim/test/test_similarities.py
index 8179c25f78..091766816a 100644
--- a/gensim/test/test_similarities.py
+++ b/gensim/test/test_similarities.py
@@ -515,24 +515,25 @@ def assertApproxNeighborsMatchExact(self, model, wv, index):
         self.assertEqual(approx_words, exact_words)
 
     def assertIndexSaved(self, index):
-        index.save('index')
-        self.assertTrue(os.path.exists('index'))
-        self.assertTrue(os.path.exists('index.d'))
+        fname = testfile()
+        index.save(fname)
+        self.assertTrue(os.path.exists(fname))
+        self.assertTrue(os.path.exists(fname + '.d'))
 
     def assertLoadedIndexEqual(self, index, model):
         from gensim.similarities.index import AnnoyIndexer
 
-        index.save('index')
+        fname = testfile()
+        index.save(fname)
 
         index2 = AnnoyIndexer()
-        index2.load('index')
+        index2.load(fname)
         index2.model = model
 
         self.assertEqual(index.index.f, index2.index.f)
         self.assertEqual(index.labels, index2.labels)
         self.assertEqual(index.num_trees, index2.num_trees)
 
-
 class TestDoc2VecAnnoyIndexer(unittest.TestCase):
 
     def setUp(self):
@@ -566,9 +567,10 @@ def testApproxNeighborsMatchExact(self):
         self.assertEqual(approx_words, exact_words)
 
     def testSave(self):
-        self.index.save('index')
-        self.assertTrue(os.path.exists('index'))
-        self.assertTrue(os.path.exists('index.d'))
+        fname = testfile()
+        self.index.save(fname)
+        self.assertTrue(os.path.exists(fname))
+        self.assertTrue(os.path.exists(fname + '.d'))
 
     def testLoadNotExist(self):
         from gensim.similarities.index import AnnoyIndexer
@@ -579,10 +581,11 @@ def testLoadNotExist(self):
     def testSaveLoad(self):
         from gensim.similarities.index import AnnoyIndexer
 
-        self.index.save('index')
+        fname = testfile()
+        self.index.save(fname)
 
         self.index2 = AnnoyIndexer()
-        self.index2.load('index')
+        self.index2.load(fname)
         self.index2.model = self.model
 
         self.assertEqual(self.index.index.f, self.index2.index.f)