diff --git a/bindep/depends.py b/bindep/depends.py
index 1ed0b05..dc6b2ea 100644
--- a/bindep/depends.py
+++ b/bindep/depends.py
@@ -140,6 +140,9 @@ class Depends(object):
         :param filename: The string name of the file from which requirements
             were loaded.
         """
+        if not depends_string.endswith('\n'):
+            # The parsley grammar expects each line to end with a newline
+            depends_string += '\n'
         parser = makeGrammar(grammar, {})(depends_string)
         self._rules = parser.rules()
         self.filename = filename
diff --git a/bindep/tests/test_depends.py b/bindep/tests/test_depends.py
index e090df7..4f86986 100644
--- a/bindep/tests/test_depends.py
+++ b/bindep/tests/test_depends.py
@@ -376,6 +376,12 @@ class TestDepends(TestCase):
         depends = Depends("")
         self.assertEqual([], depends._rules)
 
+    def test_no_newline(self):
+        depends = Depends("foo")
+        self.assertEqual(
+            [("foo", [], [])],
+            depends._rules)
+
     def test_selectors(self):
         depends = Depends("foo [!bar baz quux]\n")
         self.assertEqual(