diff --git a/service-mgmt-api/sm-api/sm_api/api/controllers/v1/utils.py b/service-mgmt-api/sm-api/sm_api/api/controllers/v1/utils.py
index 4506a3e0..8d4a9aaf 100644
--- a/service-mgmt-api/sm-api/sm_api/api/controllers/v1/utils.py
+++ b/service-mgmt-api/sm-api/sm_api/api/controllers/v1/utils.py
@@ -35,7 +35,9 @@ JSONPATCH_EXCEPTIONS = (jsonpatch.JsonPatchException,
 
 
 def validate_limit(limit):
-    if limit and limit < 0:
+    if limit is None:
+        return CONF.api_limit_max
+    elif limit < 0:
         raise wsme.exc.ClientSideError(_("Limit must be positive"))
 
     return min(CONF.api_limit_max, limit) or CONF.api_limit_max