diff --git a/lib/lwres/include/lwres/netdb.h.in b/lib/lwres/include/lwres/netdb.h.in
index 75de6afb6d..16df4a5cea 100644
--- a/lib/lwres/include/lwres/netdb.h.in
+++ b/lib/lwres/include/lwres/netdb.h.in
@@ -86,6 +86,8 @@ struct  addrinfo {
 #ifndef AI_PASSIVE
 #define AI_PASSIVE      0x00000001
 #define AI_CANONNAME    0x00000002
+#endif
+#ifndef AI_NUMERICHOST
 #define AI_NUMERICHOST  0x00000004
 #endif