diff --git a/src/option.h b/src/option.h
index af5b988..f178ea7 100644
--- a/src/option.h
+++ b/src/option.h
@@ -832,6 +832,9 @@
 EXTERN int	p_tr;		/* 'tagrelative' */
 EXTERN char_u	*p_tags;	/* 'tags' */
 EXTERN int	p_tgst;		/* 'tagstack' */
+#if defined(DYNAMIC_TCL)
+EXTERN char_u	*p_tcldll;	/* 'tcldll' */
+#endif
 #ifdef FEAT_ARABIC
 EXTERN int	p_tbidi;	/* 'termbidi' */
 #endif