diff --git a/usecases/param_wall/test1.yaml b/usecases/param_wall/test1.yaml
index d907fef..0e3d2e3 100644
--- a/usecases/param_wall/test1.yaml
+++ b/usecases/param_wall/test1.yaml
@@ -4,7 +4,7 @@ geometry_parameter:
   length:
     length: 100
     endpoint: 180
-    num: 2
+    num: 1
   height:
     length: 4.3
     endpoint: 6.6