diff --git a/lib/krb5/krb5_locl.h b/lib/krb5/krb5_locl.h
index 4554be7bc..bc39febc0 100644
--- a/lib/krb5/krb5_locl.h
+++ b/lib/krb5/krb5_locl.h
@@ -96,6 +96,9 @@
 #ifdef HAVE_ARPA_INET_H
 #include <arpa/inet.h>
 #endif
+#ifdef HAVE_ARPA_NAMESER_H
+#include <arpa/nameser.h>
+#endif
 #ifdef HAVE_SYS_UIO_H
 #include <sys/uio.h>
 #endif