diff --git a/ares/ares.h b/ares/ares.h
index c8f708edcd94485864a4beed3d212f6715b2ae98..c3959e0b4ffbee012119ab8d8bfe519f5dae8e77 100644
--- a/ares/ares.h
+++ b/ares/ares.h
@@ -20,6 +20,10 @@
 
 #include <sys/types.h>
 
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+
 #ifdef WIN32
 #include <winsock.h>
 #include <windows.h>