diff --git a/debian/changelog b/debian/changelog
index d6ecb0b..958cac0 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,7 @@
 python-blitzortung (1.5.0) unstable; urgency=low
 
   * use python properties instead of getters (this will break compatibility to earlier versions)
+  * speed improvements
 
  -- Andreas Wuerl <blitzortung@tryb.de>  Sun, 09 Aug 2015 10:36:12 +0200
 
diff --git a/tests/test_builder.py b/tests/test_builder.py
index 42b7873..e0aea18 100644
--- a/tests/test_builder.py
+++ b/tests/test_builder.py
@@ -73,6 +73,18 @@ def test_set_timestamp_from_pandas_timestamp_with_ns_offset(self):
         assert_that(timestamp.tzinfo, is_(equal_to(pytz.timezone('CET'))))
         assert_that(timestamp.nanosecond, is_(equal_to(423)))
 
+    def test_value_property(self):
+        timestamp = self.builder.set_timestamp(datetime.datetime(2012, 2, 10, 12, 56, 18, 96651)).build()
+
+        value = timestamp.value
+        assert_that(value, is_(equal_to(1328878578096651000)))
+
+    def test_value_property_with_nanoseconds(self):
+        timestamp = self.builder.set_timestamp(datetime.datetime(2012, 2, 10, 12, 56, 18, 96651), 456).build()
+
+        value = timestamp.value
+        assert_that(value, is_(equal_to(1328878578096651456)))
+
     def test_set_timestamp_from_bad_string(self):
         timestamp = self.builder.set_timestamp('0000-00-00').build()
         assert_that(timestamp.value, is_(pd.NaT.value))