diff --git a/ann_benchmarks/.DS_Store b/ann_benchmarks/.DS_Store
index 8c30ee3..ff82d8f 100644
Binary files a/ann_benchmarks/.DS_Store and b/ann_benchmarks/.DS_Store differ
diff --git a/ann_benchmarks/algorithms/nmslib.py b/ann_benchmarks/algorithms/nmslib.py
index 72f3ebc..8ee922f 100644
--- a/ann_benchmarks/algorithms/nmslib.py
+++ b/ann_benchmarks/algorithms/nmslib.py
@@ -66,6 +66,8 @@ def fit(self, X):
                 X_trans = NmslibReuseIndex.matrToStrArray(csr_matrix(X))
             else:
                 X_trans = NmslibReuseIndex.intMatrToStrArray(X)
+            self._index = nmslib.init(space=self._nmslib_metric, method=self._method_name, data_type=nmslib.DataType.OBJECT_AS_STRING)
+            self._index.addDataPointBatch(X_trans)
         else:
             self._index = nmslib.init(space=self._nmslib_metric, method=self._method_name)
             self._index.addDataPointBatch(X)