diff --git a/humanfriendly/__init__.py b/humanfriendly/__init__.py
index 4c0a333..8ef2d75 100644
--- a/humanfriendly/__init__.py
+++ b/humanfriendly/__init__.py
@@ -82,7 +82,7 @@
               dict(divider=1e-3, singular='millisecond', plural='milliseconds', abbreviations=['ms']),
               dict(divider=1, singular='second', plural='seconds', abbreviations=['s', 'sec', 'secs']),
               dict(divider=60, singular='minute', plural='minutes', abbreviations=['m', 'min', 'mins']),
-              dict(divider=60 * 60, singular='hour', plural='hours', abbreviations=['h']),
+              dict(divider=60 * 60, singular='hour', plural='hours', abbreviations=['h', 'hr', 'hrs']),
               dict(divider=60 * 60 * 24, singular='day', plural='days', abbreviations=['d']),
               dict(divider=60 * 60 * 24 * 7, singular='week', plural='weeks', abbreviations=['w']),
               dict(divider=60 * 60 * 24 * 7 * 52, singular='year', plural='years', abbreviations=['y']))
@@ -483,7 +483,7 @@ def parse_timespan(timespan):
     - ms, millisecond, milliseconds
     - s, sec, secs, second, seconds
     - m, min, mins, minute, minutes
-    - h, hour, hours
+    - h, hr, hrs, hour, hours
     - d, day, days
     - w, week, weeks
     - y, year, years
diff --git a/humanfriendly/tests.py b/humanfriendly/tests.py
index 72dad99..9bc35b0 100644
--- a/humanfriendly/tests.py
+++ b/humanfriendly/tests.py
@@ -455,6 +455,16 @@ def test_format_timespan(self):
         then = now - datetime.timedelta(hours=23)
         assert '23 hours' == format_timespan(now - then)
 
+    def test_parse_timespan_hour_abbreviations(self):
+        """Accept hour abbreviations without changing existing aliases."""
+        for unit in ('h', 'hr', 'hrs', 'hour', 'hours'):
+            for spelling in (unit, unit.upper()):
+                self.assertEqual(0, parse_timespan('0' + spelling))
+                self.assertEqual(3600, parse_timespan('1 ' + spelling))
+                self.assertEqual(9000, parse_timespan('2.5' + spelling))
+        with self.assertRaises(InvalidTimespan):
+            parse_timespan('1 hrss')
+
     def test_parse_timespan(self):
         """Test :func:`humanfriendly.parse_timespan()`."""
         self.assertEqual(0, parse_timespan('0'))