diff --git a/ChangeLog b/ChangeLog
index adcfcf87c0..774aebbc56 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jun  6 10:39:56 2016  Kazuki Yamaguchi  <k@rhe.jp>
+
+	* ext/openssl/openssl_missing.h: Include ruby/config.h. r55285 added
+	  some inline functions but VC does not recognize 'inline' keyword.
+
 Mon Jun  6 09:25:34 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* thread.c (thread_start_func_2): report raised exception if
diff --git a/ext/openssl/openssl_missing.h b/ext/openssl/openssl_missing.h
index e418c50584..67df70a5e2 100644
--- a/ext/openssl/openssl_missing.h
+++ b/ext/openssl/openssl_missing.h
@@ -10,6 +10,8 @@
 #if !defined(_OSSL_OPENSSL_MISSING_H_)
 #define _OSSL_OPENSSL_MISSING_H_
 
+#include "ruby/config.h"
+
 /* added in 0.9.8X */
 #if !defined(HAVE_EVP_CIPHER_CTX_NEW)
 EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void);