diff --git a/opal/mca/event/libevent2021/libevent/event.h b/opal/mca/event/libevent2021/libevent/event.h
index a3785b987a..e0c7582aeb 100644
--- a/opal/mca/event/libevent2021/libevent/event.h
+++ b/opal/mca/event/libevent2021/libevent/event.h
@@ -56,7 +56,7 @@ extern "C" {
 /* For int types. */
 #include <evutil.h>
 
-#ifdef WIN32
+#if defined(WIN32) && !defined(__CYGWIN__)
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
diff --git a/opal/mca/event/libevent2021/libevent/include/event2/util.h b/opal/mca/event/libevent2021/libevent/include/event2/util.h
index 2c49999209..72432315bd 100644
--- a/opal/mca/event/libevent2021/libevent/include/event2/util.h
+++ b/opal/mca/event/libevent2021/libevent/include/event2/util.h
@@ -67,7 +67,7 @@ extern "C" {
 #include <netdb.h>
 #endif
 
-#ifdef WIN32
+#if defined(WIN32) && !defined(__CYGWIN__)
 #include <winsock2.h>
 #else
 #include <sys/socket.h>