diff --git a/Lib/test/test_tcl.py b/Lib/test/test_tcl.py
index 9b1a8d7701d..3810e12ed06 100644
--- a/Lib/test/test_tcl.py
+++ b/Lib/test/test_tcl.py
@@ -391,6 +391,7 @@ def check(expr, expected):
         if tcl_version >= (8, 5):  # bignum was added in Tcl 8.5
             check('2**64', True)
 
+    @unittest.skipUnless(tcl_version >= (8, 5), 'requires Tcl version >= 8.5')
     def test_booleans(self):
         tcl = self.interp
         def check(expr, expected):