diff --git a/backend/src/utils/modelRegistryStore.ts b/backend/src/utils/modelRegistryStore.ts
index 6458efb..5ba9435 100644
--- a/backend/src/utils/modelRegistryStore.ts
+++ b/backend/src/utils/modelRegistryStore.ts
@@ -302,7 +302,8 @@ function writeProfileRegistry(registry: ModelRegistry): void {
   const profilePath = getModelRegistryPath();
   fs.mkdirSync(path.dirname(profilePath), { recursive: true });
   fs.writeFileSync(`${profilePath}.tmp`, `${JSON.stringify(registry, null, 2)}\n`, "utf-8");
-  fs.renameSync(`${profilePath}.tmp`, profilePath);
+  fs.copyFileSync(`${profilePath}.tmp`, profilePath);
+  fs.unlinkSync(`${profilePath}.tmp`);
 }
 
 function registryFromEnvJson(env: Record<string, string>): ModelRegistry {