diff --git a/poky/meta/classes/license_image.bbclass b/poky/meta/classes/license_image.bbclass
index 0a5ea0a..7e1d0e0 100644
--- a/poky/meta/classes/license_image.bbclass
+++ b/poky/meta/classes/license_image.bbclass
@@ -19,8 +19,8 @@
 
     pkgs = image_list_installed_packages(d)
     output = format_pkg_list(pkgs)
-    open(os.path.join(license_image_dir, 'package.manifest'),
-        'w+').write(output)
+    with open(os.path.join(license_image_dir, 'package.manifest'), "w+") as package_manifest:
+        package_manifest.write(output)
 }
 
 python license_create_manifest() {