diff --git a/swh/objstorage/api/server.py b/swh/objstorage/api/server.py
--- a/swh/objstorage/api/server.py
+++ b/swh/objstorage/api/server.py
@@ -43,7 +43,7 @@
 
 def get_objstorage():
     global objstorage
-    if not objstorage:
+    if objstorage is None:
         objstorage = get_swhobjstorage(**app.config["objstorage"])
 
     return objstorage