diff --git a/ext/socket/getaddrinfo.c b/ext/socket/getaddrinfo.c
index 68f610e807..6d6d11fa8f 100644
--- a/ext/socket/getaddrinfo.c
+++ b/ext/socket/getaddrinfo.c
@@ -66,6 +66,9 @@
 #endif
 #include <unistd.h>
 #else
+#if defined(_MSC_VER) && _MSC_VER <= 1200
+#include <windows.h>
+#endif
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #include <io.h>
diff --git a/ext/socket/getnameinfo.c b/ext/socket/getnameinfo.c
index 4da9680ccb..d54a7c8c0d 100644
--- a/ext/socket/getnameinfo.c
+++ b/ext/socket/getnameinfo.c
@@ -59,6 +59,9 @@
 #endif
 #endif
 #ifdef _WIN32
+#if defined(_MSC_VER) && _MSC_VER <= 1200
+#include <windows.h>
+#endif
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #define snprintf _snprintf
diff --git a/include/ruby/win32.h b/include/ruby/win32.h
index 9daea06323..7bf389d8e1 100644
--- a/include/ruby/win32.h
+++ b/include/ruby/win32.h
@@ -35,6 +35,9 @@ extern "C++" {			/* template without extern "C++" */
 #if !defined(_WIN64) && !defined(WIN32)
 #define WIN32
 #endif
+#if defined(_MSC_VER) && _MSC_VER <= 1200
+#include <windows.h>
+#endif
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #if !defined(_MSC_VER) || _MSC_VER >= 1400