diff --git a/lib/krb5/krb5.h b/lib/krb5/krb5.h
index 61ef78363..048fa6719 100644
--- a/lib/krb5/krb5.h
+++ b/lib/krb5/krb5.h
@@ -78,6 +78,8 @@ typedef struct krb5_get_creds_opt_data *krb5_get_creds_opt;
 struct krb5_digest;
 typedef struct krb5_digest *krb5_digest;
 
+struct krb5_pac;
+
 typedef struct krb5_rd_req_in_ctx *krb5_rd_req_in_ctx;
 typedef struct krb5_rd_req_out_ctx *krb5_rd_req_out_ctx;