diff --git a/Modules/Setup.dist b/Modules/Setup.dist
index e1c8fe4..56f3314 100644
--- a/Modules/Setup.dist
+++ b/Modules/Setup.dist
@@ -207,7 +207,7 @@
 #
 # First, look at Setup.config; configure may have set this for you.
 
-#crypt cryptmodule.c # -lcrypt	# crypt(3); needs -lcrypt on some systems
+#_crypt _cryptmodule.c # -lcrypt	# crypt(3); needs -lcrypt on some systems
 
 
 # Some more UNIX dependent modules -- off by default, since these
diff --git a/Modules/cryptmodule.c b/Modules/_cryptmodule.c
similarity index 97%
rename from Modules/cryptmodule.c
rename to Modules/_cryptmodule.c
index d5a42ff..5100788 100644
--- a/Modules/cryptmodule.c
+++ b/Modules/_cryptmodule.c
@@ -45,7 +45,7 @@
 
 static struct PyModuleDef cryptmodule = {
     PyModuleDef_HEAD_INIT,
-    "crypt",
+    "_crypt",
     NULL,
     -1,
     crypt_methods,
@@ -56,7 +56,7 @@
 };
 
 PyMODINIT_FUNC
-PyInit_crypt(void)
+PyInit__crypt(void)
 {
     return PyModule_Create(&cryptmodule);
 }