diff --git a/src/mol-plugin/ui/image.tsx b/src/mol-plugin/ui/image.tsx
index 0653fca1b109ade0a233acfadb253f0fff451fa2..bf4d7985374194f50895d75d70e3bea240aca76b 100644
--- a/src/mol-plugin/ui/image.tsx
+++ b/src/mol-plugin/ui/image.tsx
@@ -87,8 +87,8 @@ export class ImageControls<P, S extends ImageControlsState> extends CollapsableC
             canvasCtx.putImageData(imageData, 0, 0)
 
             await ctx.update('Downloading image...')
-            const blob = await canvasToBlob(canvas)
-            download(blob, 'molstar-image')
+            const blob = await canvasToBlob(canvas, 'png')
+            download(blob, 'molstar-image.png')
         })
     }