diff --git a/tools/yaml-validate.py b/tools/yaml-validate.py
index b4e135e204..bb9f1572f5 100755
--- a/tools/yaml-validate.py
+++ b/tools/yaml-validate.py
@@ -1162,12 +1162,14 @@ def validate_network_data_file(data_file_path):
         data_file = yaml.load(open(data_file_path).read())
         base_file_path = os.path.dirname(data_file_path) + "/network_data.yaml"
         base_file = yaml.load(open(base_file_path).read())
+        retval = 0
         for n in base_file:
             if n not in data_file:
                 print('ERROR: The following network from network_data.yaml is '
                       'missing or differs in %s : %s'
                       % (data_file_path, n))
-                return 1
+                retval = 1
+        return retval
     except Exception:
         print(traceback.format_exc())
         return 1