diff --git a/ChangeLog b/ChangeLog
index 6093c181ab..0ac5e4c3f6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Jun  1 09:37:26 2016  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* missing/crypt.c (des_setkey): void function never returns any value.
+
 Wed Jun  1 09:16:22 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* crypt.h: separate header file from missing/crypt.c.
diff --git a/missing/crypt.c b/missing/crypt.c
index 0794e1f415..b3faaa62c7 100644
--- a/missing/crypt.c
+++ b/missing/crypt.c
@@ -413,7 +413,7 @@ crypt_r(const char *key, const char *setting, struct crypt_data *data)
 void
 des_setkey(const char *key)
 {
-    return des_setkey_r(key, &default_crypt_data);
+    des_setkey_r(key, &default_crypt_data);
 }
 
 void