diff --git a/src/globals.h b/src/globals.h
index adde271..86d8ad9 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -410,7 +410,8 @@
 
 #ifdef FEAT_DIFF
 /* Value set from 'diffopt'. */
-EXTERN int	diff_context INIT(= 6);	/* context for folds */
+EXTERN int	diff_context INIT(= 6);		/* context for folds */
+EXTERN int	diff_foldcolumn INIT(= 2);	/* 'foldcolumn' for diff mode */
 EXTERN int	diff_need_scrollbind INIT(= FALSE);
 #endif