diff --git a/num2words/__init__.py b/num2words/__init__.py
index f03cc6b..07ef2bc 100644
--- a/num2words/__init__.py
+++ b/num2words/__init__.py
@@ -18,11 +18,11 @@
 from __future__ import unicode_literals
 
 from . import (lang_AR, lang_CZ, lang_DE, lang_DK, lang_EN, lang_EN_IN,
-               lang_ES, lang_ES_CO, lang_ES_NI, lang_ES_VE, lang_FI, lang_FR, lang_FR_BE,
-               lang_FR_CH, lang_FR_DZ, lang_HE, lang_ID, lang_IT, lang_JA,
-               lang_KN, lang_KO, lang_LT, lang_LV, lang_NL, lang_NO, lang_PL,
-               lang_PT, lang_PT_BR, lang_RO, lang_RU, lang_SL, lang_SR,
-               lang_TH, lang_TR, lang_UK, lang_VI)
+               lang_ES, lang_ES_CO, lang_ES_NI, lang_ES_VE, lang_FI, lang_FR,
+               lang_FR_BE, lang_FR_CH, lang_FR_DZ, lang_HE, lang_ID, lang_IT,
+               lang_JA, lang_KN, lang_KO, lang_LT, lang_LV, lang_NL, lang_NO,
+               lang_PL, lang_PT, lang_PT_BR, lang_RO, lang_RU, lang_SL,
+               lang_SR, lang_TH, lang_TR, lang_UK, lang_VI)
 
 CONVERTER_CLASSES = {
     'ar': lang_AR.Num2Word_AR(),
diff --git a/tests/test_es_ni.py b/tests/test_es_ni.py
new file mode 100644
index 0000000..619e6a1
--- /dev/null
+++ b/tests/test_es_ni.py
@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) 2003, Taro Ogawa.  All Rights Reserved.
+# Copyright (c) 2013, Savoir-faire Linux inc.  All Rights Reserved.
+
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+# MA 02110-1301 USA
+
+from __future__ import unicode_literals
+
+from num2words import num2words
+
+from . import test_es
+
+TEST_NIO = (
+    (1.0, 'un córdoba con cero centavos'),
+    (2.0, 'dos córdobas con cero centavos'),
+    (8.0, 'ocho córdobas con cero centavos'),
+    (12.0, 'doce córdobas con cero centavos'),
+    (21.0, 'veintiun córdobas con cero centavos'),
+    (81.25, 'ochenta y un córdobas con veinticinco centavos'),
+    (100.00, 'cien córdobas con cero centavos'),
+)
+
+
+class Num2WordsESNITest(test_es.Num2WordsESTest):
+
+    def test_currency(self):
+        for test in TEST_NIO:
+            self.assertEqual(
+                num2words(test[0], lang='es_NI', to='currency'),
+                test[1]
+            )