diff --git a/src/option.h b/src/option.h
index b49c0c4..f0ebc8d 100644
--- a/src/option.h
+++ b/src/option.h
@@ -815,6 +815,7 @@
 # define TTYM_JSBTERM		0x10
 # define TTYM_PTERM		0x20
 #endif
+EXTERN char_u	*p_udir;	/* 'undodir' */
 EXTERN long	p_ul;		/* 'undolevels' */
 EXTERN long	p_uc;		/* 'updatecount' */
 EXTERN long	p_ut;		/* 'updatetime' */
@@ -1004,6 +1005,7 @@
     , BV_TS
     , BV_TW
     , BV_TX
+    , BV_UDF
     , BV_WM
     , BV_COUNT	    /* must be the last one */
 };