diff --git a/app/core/gimpbrushgenerated.c b/app/core/gimpbrushgenerated.c
index 05c9c2f36e..f99c828364 100644
--- a/app/core/gimpbrushgenerated.c
+++ b/app/core/gimpbrushgenerated.c
@@ -324,7 +324,7 @@ gimp_brush_generated_transform_size (GimpBrush *gbrush,
 
   gimp_brush_generated_get_half_size (brush,
                                       brush->shape,
-                                      brush->radius * scale,
+                                      brush->radius * (scale / 2),
                                       brush->spikes,
                                       brush->hardness,
                                       ratio,
@@ -366,7 +366,7 @@ gimp_brush_generated_transform_mask (GimpBrush *gbrush,
 
   return gimp_brush_generated_calc (brush,
                                     brush->shape,
-                                    brush->radius * scale ,
+                                    brush->radius * (scale / 2),
                                     brush->spikes,
                                     brush->hardness * hardness,
                                     ratio,