diff --git a/Modules/Setup b/Modules/Setup
index 40266a1..9dcca13 100644
--- a/Modules/Setup
+++ b/Modules/Setup
@@ -247,8 +247,8 @@
 # The _sha module implements the SHA checksum algorithms.
 # (NIST's Secure Hash Algorithms.)
 #_sha1 sha1module.c
-#_sha256 sha256module.c
-#_sha512 sha512module.c
+#_sha256 sha256module.c -DPy_BUILD_CORE_BUILTIN
+#_sha512 sha512module.c -DPy_BUILD_CORE_BUILTIN
 #_sha3 _sha3/sha3module.c
 
 # _blake module