diff --git a/src/virtual-machine.js b/src/virtual-machine.js
index 34188183d..87e63fda7 100644
--- a/src/virtual-machine.js
+++ b/src/virtual-machine.js
@@ -639,6 +639,7 @@ class VirtualMachine extends EventEmitter {
         // so the dataFormat should be 'svg'
         costume.dataFormat = storage.DataFormat.SVG;
         costume.md5 = `${costume.assetId}.${costume.dataFormat}`;
+        delete costume.bitmapResolution;
         this.emitTargetsUpdate();
     }