diff --git a/src/Site/SiteManager.py b/src/Site/SiteManager.py
index 4b5bab97..40724866 100644
--- a/src/Site/SiteManager.py
+++ b/src/Site/SiteManager.py
@@ -102,7 +102,7 @@ class SiteManager(object):
 
         s = time.time()
         if data:
-            helper.atomicWrite("%s/sites.json" % config.data_dir, json.dumps(data, indent=2, sort_keys=True))
+            helper.atomicWrite("%s/sites.json" % config.data_dir, json.dumps(data, indent=2, sort_keys=True).encode())
         else:
             self.log.debug("Save error: No data")
         time_write = time.time() - s