diff --git a/src/drawline.c b/src/drawline.c
index 1d65f3b..764d0fb 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -2274,7 +2274,7 @@
 				}
 
 				if (above)
-				    wlv.vcol_off_tp = vim_strsize(wlv.p_extra);
+				    wlv.vcol_off_tp += vim_strsize(wlv.p_extra);
 
 				if (lcs_eol_one < 0
 					&& wp->w_p_wrap