diff --git a/ChangeLog b/ChangeLog
index 7d88382d93..7eaf6b2d11 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,7 +1,7 @@
-Tue Jan 21 04:27:30 2014  Tanaka Akira  <akr@fsij.org>
+Tue Jan 21 04:31:23 2014  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/option.c: Use "int" for IP_MULTICAST_LOOP and
-	  IP_MULTICAST_TTL on Mac OS X.
+	  IP_MULTICAST_TTL on Mac OS X and Windows.
 
 Tue Jan 21 00:39:15 2014  Tanaka Akira  <akr@fsij.org>
 
diff --git a/ext/socket/option.c b/ext/socket/option.c
index 74bc15a106..2aa0768368 100644
--- a/ext/socket/option.c
+++ b/ext/socket/option.c
@@ -7,7 +7,7 @@ VALUE rb_cSockOpt;
 #define CAT(x,y) x##y
 #define XCAT(x,y) CAT(x,y)
 
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__) || defined(_WIN32)
 # define TYPE_IP_MULTICAST_LOOP int
 # define TYPE_IP_MULTICAST_TTL int
 #else