diff --git a/include/netdb.h b/include/netdb.h
index 5f1dd3f179e36200bea483678da35d69c0bafcc2..6e181b6e173b858354ad49af82b79ef5ed93495e 100644
--- a/include/netdb.h
+++ b/include/netdb.h
@@ -138,6 +138,14 @@ struct hostent *gethostbyname2(const char *, int);
 int gethostbyaddr_r(const void *, socklen_t, int, struct hostent *, char *, size_t, struct hostent **, int *);
 int getservbyport_r(int, const char *, struct servent *, char *, size_t, struct servent **);
 int getservbyname_r(const char *, const char *, struct servent *, char *, size_t, struct servent **);
+#define EAI_NODATA     -5
+#define EAI_ADDRFAMILY -9
+#define EAI_INPROGRESS -100
+#define EAI_CANCELED   -101
+#define EAI_NOTCANCELED -102
+#define EAI_ALLDONE    -103
+#define EAI_INTR       -104
+#define EAI_IDN_ENCODE -105
 #endif