diff --git a/polygon.lua b/polygon.lua
index 4ad97e1..0a43782 100644
--- a/polygon.lua
+++ b/polygon.lua
@@ -184,7 +184,7 @@ function Polygon:clone()
 end
 
 -- get bounding box
-function Polygon:getBBox()
+function Polygon:bbox()
 	local ulx,uly = self.vertices[1].x, self.vertices[1].y
 	local lrx,lry = ulx,uly
 	for i=2,#self.vertices do
diff --git a/shapes.lua b/shapes.lua
index a472cdd..3fadc26 100644
--- a/shapes.lua
+++ b/shapes.lua
@@ -281,11 +281,11 @@ function PointShape:outcircle()
 end
 
 function ConvexPolygonShape:bbox()
-	return self._polygon:getBBox()
+	return self._polygon:bbox()
 end
 
 function ConcavePolygonShape:bbox()
-	return self._polygon:getBBox()
+	return self._polygon:bbox()
 end
 
 function CircleShape:bbox()