diff --git a/Lib/test/test_capi.py b/Lib/test/test_capi.py
index 6f75b77..22c8eb0 100644
--- a/Lib/test/test_capi.py
+++ b/Lib/test/test_capi.py
@@ -9,6 +9,7 @@
 import time
 import unittest
 from test import support
+from test.support import MISSING_C_DOCSTRINGS
 try:
     import _posixsubprocess
 except ImportError:
@@ -109,6 +110,8 @@
         self.assertRaises(TypeError, _posixsubprocess.fork_exec,
                           Z(),[b'1'],3,[1, 2],5,6,7,8,9,10,11,12,13,14,15,16,17)
 
+    @unittest.skipIf(MISSING_C_DOCSTRINGS,
+                     "Signature information for builtins requires docstrings")
     def test_docstring_signature_parsing(self):
 
         self.assertEqual(_testcapi.no_docstring.__doc__, None)
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index 0258d3df..365f592 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -17,6 +17,7 @@
     ThreadPoolExecutor = None
 
 from test.support import run_unittest, TESTFN, DirsOnSysPath
+from test.support import MISSING_C_DOCSTRINGS
 from test.script_helper import assert_python_ok, assert_python_failure
 from test import inspect_fodder as mod
 from test import inspect_fodder2 as mod2
@@ -1579,7 +1580,7 @@
                            ('kwargs', ..., int, "var_keyword")),
                           ...))
 
-    def test_signature_on_builtin_function(self):
+    def test_signature_on_unsupported_builtins(self):
         with self.assertRaisesRegex(ValueError, 'not supported by signature'):
             inspect.signature(type)
         with self.assertRaisesRegex(ValueError, 'not supported by signature'):
@@ -1588,6 +1589,10 @@
         with self.assertRaisesRegex(ValueError, 'not supported by signature'):
             # support for 'method-wrapper'
             inspect.signature(min.__call__)
+
+    @unittest.skipIf(MISSING_C_DOCSTRINGS,
+                     "Signature information for builtins requires docstrings")
+    def test_signature_on_builtins(self):
         self.assertEqual(inspect.signature(min), None)
         signature = inspect.signature(os.stat)
         self.assertTrue(isinstance(signature, inspect.Signature))