diff --git a/src/widget.c b/src/widget.c
index 15dd25f8221..ab4c4f869b5 100644
--- a/src/widget.c
+++ b/src/widget.c
@@ -434,8 +434,7 @@ set_frame_size (ew)
 	 : (FRAME_SCROLL_BAR_COLS (frame)
 	    * FONT_WIDTH (frame->output_data.x->font)));
 
-    frame->output_data.x->fringes_extra
-      = FRAME_FRINGE_WIDTH (frame);
+    x_compute_fringe_widths (frame, 0);
 
     change_frame_size (frame, h, w, 1, 0, 0);
     char_to_pixel_size (ew, w, h, &pixel_width, &pixel_height);
@@ -912,8 +911,7 @@ EmacsFrameSetCharSize (widget, columns, rows)
        ? 0
        : (FRAME_SCROLL_BAR_COLS (f) * FONT_WIDTH (f->output_data.x->font)));
 
-  f->output_data.x->fringes_extra
-    = FRAME_FRINGE_WIDTH (f);
+  x_compute_fringe_widths (f, 0);
 
   char_to_pixel_size (ew, columns, rows, &pixel_width, &pixel_height);