diff --git a/xpcPlugin/UDPSocket.h b/xpcPlugin/UDPSocket.h
index a1ee920..398d8ea 100644
--- a/xpcPlugin/UDPSocket.h
+++ b/xpcPlugin/UDPSocket.h
@@ -14,6 +14,7 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <unistd.h>
+#include <sys/select.h>
 #endif