diff --git a/num2words/__init__.py b/num2words/__init__.py
index b6969060..88314b4b 100644
--- a/num2words/__init__.py
+++ b/num2words/__init__.py
@@ -116,4 +116,10 @@ def num2words(number, ordinal=False, lang='en', to='cardinal', **kwargs):
     if to not in CONVERTES_TYPES:
         raise NotImplementedError()
 
+    # Float values equal to an integer (e.g. 1.0, 2.0) are valid ordinals;
+    # convert them to int so to_ordinal_num doesn't embed the decimal point
+    # in the formatted result (e.g. "1.0st" instead of the correct "1st").
+    if to in ('ordinal', 'ordinal_num') and isinstance(number, float) and number == int(number):
+        number = int(number)
+
     return getattr(converter, 'to_{}'.format(to))(number, **kwargs)
diff --git a/tests/test_en.py b/tests/test_en.py
index dd80ac0d..39ec52df 100644
--- a/tests/test_en.py
+++ b/tests/test_en.py
@@ -60,6 +60,10 @@ def test_ordinal_num(self):
         self.assertEqual(num2words(21, lang='en', to='ordinal_num'), '21st')
         self.assertEqual(num2words(102, lang='en', to='ordinal_num'), '102nd')
         self.assertEqual(num2words(73, lang='en', to='ordinal_num'), '73rd')
+        # integer-valued floats should format without the decimal point
+        self.assertEqual(num2words(1.0, lang='en', to='ordinal_num'), '1st')
+        self.assertEqual(num2words(2.0, lang='en', to='ordinal_num'), '2nd')
+        self.assertEqual(num2words(21.0, lang='en', to='ordinal_num'), '21st')
 
     def test_cardinal_for_float_number(self):
         self.assertEqual(num2words(0.12), "zero point one two")