diff --git a/kdc/kdc_locl.h b/kdc/kdc_locl.h
index 3682e348b..15ffbbbad 100644
--- a/kdc/kdc_locl.h
+++ b/kdc/kdc_locl.h
@@ -77,6 +77,7 @@
 
 #include "hdb.h"
 
+extern require_enc_timestamp;
 extern sig_atomic_t exit_flag;
 
 extern struct timeval now;