diff --git a/Engine/src/shared/sprites.ts b/Engine/src/shared/sprites.ts
index 2cd5b4b..619ade2 100644
--- a/Engine/src/shared/sprites.ts
+++ b/Engine/src/shared/sprites.ts
@@ -51,11 +51,13 @@ export class SpriteInstance {
       this.frameCount = this.subset.frames.length
       this.frame = this.subset.frames[this.frameIndex]
       let s = new PIXI.Sprite(this.frame.texture)
-      s.x -= this.frame.originX
-      s.y -= this.frame.originY
+      let originX = this.frame.originX ?? this.frame.width/2
+      let originY = this.frame.originY ?? this.frame.height/2
+      s.x -= originX
+      s.y -= originY
       this.container.addChild(s)
-      this.container.pivot.x -= this.frame.originX
-      this.container.pivot.y -= this.frame.originY
+      this.container.pivot.x = originX
+      this.container.pivot.y = originY
     }
   }