diff --git a/lib/krb5/krb5_locl.h b/lib/krb5/krb5_locl.h
index baa3e5af2..8ff5d99df 100644
--- a/lib/krb5/krb5_locl.h
+++ b/lib/krb5/krb5_locl.h
@@ -93,6 +93,11 @@
 #ifdef HAVE_NETDB_H
 #include <netdb.h>
 #endif
+#ifdef _AIX
+struct ether_addr;
+struct mbuf;
+struct sockaddr_dl;
+#endif
 #ifdef HAVE_ARPA_INET_H
 #include <arpa/inet.h>
 #endif