diff --git a/src/xcb_conn.c b/src/xcb_conn.c
index a017c20..3ab5385 100644
--- a/src/xcb_conn.c
+++ b/src/xcb_conn.c
@@ -44,6 +44,7 @@
 #ifdef _WIN32
 #include "xcb_windefs.h"
 #else
+#include <sys/socket.h>
 #include <netinet/in.h>
 #endif /* _WIN32 */