diff --git a/source/blender/editors/gpencil/gpencil_fill.c b/source/blender/editors/gpencil/gpencil_fill.c
index a81d319ab42..bf228af88a5 100644
--- a/source/blender/editors/gpencil/gpencil_fill.c
+++ b/source/blender/editors/gpencil/gpencil_fill.c
@@ -621,8 +621,8 @@ static bool gpencil_render_offscreen(tGPDfill *tgpf)
   }
 
   /* set temporary new size */
-  tgpf->bwinx = tgpf->region->sizex;
-  tgpf->bwiny = tgpf->region->sizey;
+  tgpf->bwinx = tgpf->region->winx;
+  tgpf->bwiny = tgpf->region->winy;
   tgpf->brect = tgpf->region->winrct;
 
   /* resize region */