diff --git a/source/blender/render/intern/source/convertblender.c b/source/blender/render/intern/source/convertblender.c
index ba2d245dbd6..91d3d368239 100644
--- a/source/blender/render/intern/source/convertblender.c
+++ b/source/blender/render/intern/source/convertblender.c
@@ -2391,7 +2391,7 @@ static void do_displacement(Render *re, ObjectRen *obr, float mat[][4], float im
 	/* Object Size with parenting */
 	obt=obr->ob;
 	while(obt){
-		mul_v3_v3v3(temp, obt->size, obt->dsize);
+		add_v3_v3v3(temp, obt->size, obt->dsize);
 		scale[0]*=temp[0]; scale[1]*=temp[1]; scale[2]*=temp[2];
 		obt=obt->parent;
 	}