diff --git a/tests.py b/tests.py
index 7d177fd..a9bd4ec 100755
--- a/tests.py
+++ b/tests.py
@@ -359,6 +359,13 @@ def test_multiple_class_selector(self):
         output = Pynliner().from_string(html).with_cssString(css).run()
         self.assertEqual(output, expected)
 
+    def test_conflicting_multiple_class_selector(self):
+        html = """<h1 class="a b">Hello World!</h1><h1 class="a">I should not be changed</h1>"""
+        css = """h1.a.b { color: red; }"""
+        expected = u'<h1 class="a b" style="color: red">Hello World!</h1><h1 class="a">I should not be changed</h1>'
+        output = Pynliner().from_string(html).with_cssString(css).run()
+        self.assertEqual(output, expected)
+
     def test_combination_selector(self):
         html = """<h1 id="a" class="b">Hello World!</h1>"""
         css = """h1#a.b { color: red; }"""