diff --git a/sub/osd.c b/sub/osd.c
index d33aabdd53..58cc859a94 100644
--- a/sub/osd.c
+++ b/sub/osd.c
@@ -515,10 +515,16 @@ void osd_rescale_bitmaps(struct sub_bitmaps *imgs, int frame_w, int frame_h,
     int cy = vidh / 2 - (int)(frame_h * yscale) / 2;
     for (int i = 0; i < imgs->num_parts; i++) {
         struct sub_bitmap *bi = &imgs->parts[i];
-        bi->x = (int)(bi->x * xscale) + cx + res.ml;
-        bi->y = (int)(bi->y * yscale) + cy + res.mt;
-        bi->dw = (int)(bi->w * xscale + 0.5);
-        bi->dh = (int)(bi->h * yscale + 0.5);
+        struct mp_rect rc = {
+            .x0 = lrint(bi->x * xscale),
+            .y0 = lrint(bi->y * yscale),
+            .x1 = lrint((bi->x + bi->w) * xscale),
+            .y1 = lrint((bi->y + bi->h) * yscale),
+        };
+        bi->x = rc.x0 + cx + res.ml;
+        bi->y = rc.y0 + cy + res.mt;
+        bi->dw = mp_rect_w(rc);
+        bi->dh = mp_rect_h(rc);
     }
 }