diff --git a/src/calibre/utils/smartypants.py b/src/calibre/utils/smartypants.py
index 3d44112f08..a00a615122 100644
--- a/src/calibre/utils/smartypants.py
+++ b/src/calibre/utils/smartypants.py
@@ -875,6 +875,8 @@ def run_tests(return_tests=False):
 
         def test_educated_quotes(self):
             self.assertEqual(sp('''"Isn't this fun?"'''), '''“Isn’t this fun?”''')
+            self.assertEqual(sp("'abc'"), '‘abc’')
+
 
     tests = unittest.defaultTestLoader.loadTestsFromTestCase(TestSmartypantsAllAttributes)
     if return_tests: