diff --git a/control/tests/xferfcn_test.py b/control/tests/xferfcn_test.py
index 0d208c6db..44953e731 100644
--- a/control/tests/xferfcn_test.py
+++ b/control/tests/xferfcn_test.py
@@ -536,6 +536,7 @@ def testMIMO(self):
         np.testing.assert_array_almost_equal(H.num[1][0], H2.num[1][0])
         np.testing.assert_array_almost_equal(H.den[1][0], H2.den[1][0])
 
+    @unittest.skipIf(not slycot_check(), "slycot not installed")
     def testIndexing(self):
         tm = ss2tf(rss(5, 3, 3))