diff --git a/backups/rsyncvolumes/plan.tpl.py b/backups/rsyncvolumes/plan.tpl.py
index 02aed59..ed7adfb 100644
--- a/backups/rsyncvolumes/plan.tpl.py
+++ b/backups/rsyncvolumes/plan.tpl.py
@@ -30,8 +30,9 @@ def zipdir(path, ziph):
     # ziph is zipfile handle
     for root, dirs, files in walk(path):
         for file in files:
-            if isfile(file):
-                ziph.write(osjoin(root, file))
+            pfile = osjoin(root, file)
+            if isfile(pfile):
+                ziph.write(pfile)
 
 f = ZipFile(zippath, 'w', ZIP_DEFLATED)
 zipdir('${SOURCE}', f)