diff --git a/src/hb-font.hh b/src/hb-font.hh
index 4520c7885..a9b1e0bce 100644
--- a/src/hb-font.hh
+++ b/src/hb-font.hh
@@ -208,6 +208,21 @@ struct hb_font_t
     extents->width = ceilf (x2) - extents->x_bearing;
     extents->height = ceilf (y2) - extents->y_bearing;
 
+    if (x_strength || y_strength)
+    {
+      /* Y */
+      int y_shift = y_strength;
+      if (y_scale < 0) y_shift = -y_shift;
+      extents->y_bearing += y_shift;
+      extents->height -= y_shift;
+
+      /* X */
+      int x_shift = x_strength;
+      if (x_scale < 0) x_shift = -x_shift;
+      if (embolden_in_place)
+	extents->x_bearing -= x_shift / 2;
+      extents->width += x_shift;
+    }
   }