diff --git a/poky/meta/classes/package.bbclass b/poky/meta/classes/package.bbclass
index d1e9138..0fe9576 100644
--- a/poky/meta/classes/package.bbclass
+++ b/poky/meta/classes/package.bbclass
@@ -368,7 +368,8 @@
     # is still assuming that.
     debuglistoutput = '\0'.join(debugsources) + '\0'
     lf = bb.utils.lockfile(sourcefile + ".lock")
-    open(sourcefile, 'a').write(debuglistoutput)
+    with open(sourcefile, 'a') as sf:
+        sf.write(debuglistoutput)
     bb.utils.unlockfile(lf)