diff --git a/num2words/lang_PT_BR.py b/num2words/lang_PT_BR.py
index 2c50f03..2aea06c 100644
--- a/num2words/lang_PT_BR.py
+++ b/num2words/lang_PT_BR.py
@@ -49,7 +49,7 @@ class Num2Word_PT_BR(lang_PT.Num2Word_PT):
             if nnum < 1000000:
                 return next
             ctext = "um"
-        elif cnum == 100 and not nnum == 1000:
+        elif cnum == 100 and nnum % 1000 != 0:
             ctext = "cento"
 
         if nnum < cnum:
diff --git a/tests/test_pt_BR.py b/tests/test_pt_BR.py
index bbf9e8d..87e231b 100644
--- a/tests/test_pt_BR.py
+++ b/tests/test_pt_BR.py
@@ -80,6 +80,12 @@ class Num2WordsPTBRTest(TestCase):
         self.assertEqual(
             num2words(6000000, lang='pt_BR'), 'seis milhões'
         )
+        self.assertEqual(
+            num2words(100000000, lang='pt_BR'), 'cem milhões'
+        )
+        self.assertEqual(
+            num2words(100000000000, lang='pt_BR'), 'cem bilhões'
+        )
         self.assertEqual(
             num2words(19000000000, lang='pt_BR'), 'dezenove bilhões'
         )