diff --git a/test/json_config/config_filter.py b/test/json_config/config_filter.py
index c764c964f..831b7a11c 100755
--- a/test/json_config/config_filter.py
+++ b/test/json_config/config_filter.py
@@ -60,6 +60,7 @@ def check_empty():
     for s in data['subsystems']:
         if s['config']:
             print("Config not empty")
+            print(s['config'])
             sys.exit(1)