diff --git a/Lib/test/test_cppext.py b/Lib/test/test_cppext.py
index e056410456630e..337cb08f8c9d8c 100644
--- a/Lib/test/test_cppext.py
+++ b/Lib/test/test_cppext.py
@@ -37,6 +37,7 @@
     CPPFLAGS = []
 
 
+@support.requires_subprocess()
 class TestCPPExt(unittest.TestCase):
     def build(self):
         cpp_ext = Extension(