diff --git a/fclauncher/Prism.go b/fclauncher/Prism.go
index 2bfcd8c..60e62a2 100644
--- a/fclauncher/Prism.go
+++ b/fclauncher/Prism.go
@@ -131,7 +131,7 @@ func (p *Prism)InstallModpack(modpack Modpack){
 	json.Unmarshal(buff.Bytes(), &versions)
 	version := versions[len(versions)-1]
 	dname, _ := os.MkdirTemp("", "fclauncher-*")
-	f, _ := os.OpenFile(filepath.Join(dname, modpack.Name), os.O_CREATE|os.O_RDWR, 0755)
+	f, _ := os.OpenFile(filepath.Join(dname, modpack.Name+".mrpack"), os.O_CREATE|os.O_RDWR, 0755)
 	defer f.Close()
 	HttpDownload(modpack.Id + "/" + version.File, f, p.ctx)