diff --git a/bufferevent_openssl.c b/bufferevent_openssl.c
index f5d0808c..b6548116 100644
--- a/bufferevent_openssl.c
+++ b/bufferevent_openssl.c
@@ -24,6 +24,13 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include "event2/event-config.h"
+#include "evconfig-private.h"
+
+#ifdef _WIN32
+#  include <winsock2.h>
+#endif
+
 #include <string.h>
 
 #include <openssl/ssl.h>