diff --git a/lib/krb5/krb5_locl.h b/lib/krb5/krb5_locl.h
index e9d74e260..b8687120c 100644
--- a/lib/krb5/krb5_locl.h
+++ b/lib/krb5/krb5_locl.h
@@ -178,7 +178,9 @@ struct _krb5_krb_auth_data;
 #endif
 #endif
 
+#ifndef KRB5_ADDRESSLESS_DEFAULT
 #define KRB5_ADDRESSLESS_DEFAULT FALSE
+#endif
 
 typedef enum {
     KRB5_PA_PAC_DONT_CARE = 0,