diff --git a/src/store/segmentGroups.ts b/src/store/segmentGroups.ts
index fb9929d98..b04238103 100644
--- a/src/store/segmentGroups.ts
+++ b/src/store/segmentGroups.ts
@@ -60,6 +60,7 @@ const writeImage = async (format: string, image: vtkImageData) => {
   }
 
   const result = await writeImageItk(null, itkImage, `image.${format}`);
+  result.webWorker?.terminate();
   return result.serializedImage.data;
 };