Renamed PyString to PyBytes
diff --git a/Modules/sha512module.c b/Modules/sha512module.c
index 3e32132..3fe5a1b 100644
--- a/Modules/sha512module.c
+++ b/Modules/sha512module.c
@@ -498,7 +498,7 @@
 
     SHAcopy(self, &temp);
     sha512_final(digest, &temp);
-    return PyString_FromStringAndSize((const char *)digest, self->digestsize);
+    return PyBytes_FromStringAndSize((const char *)digest, self->digestsize);
 }
 
 PyDoc_STRVAR(SHA512_hexdigest__doc__,