diff --git a/configs/ruby/CHI.py b/configs/ruby/CHI.py
index d31d2336ba..df97b923ae 100644
--- a/configs/ruby/CHI.py
+++ b/configs/ruby/CHI.py
@@ -266,7 +266,8 @@ def create_system(
 
     ruby_system.network.control_msg_size = params.cntrl_msg_size
     ruby_system.network.data_msg_size = params.data_width
-    ruby_system.network.buffer_size = params.router_buffer_size
+    if options.network == "simple":
+        ruby_system.network.buffer_size = params.router_buffer_size
 
     # Incorporate the params into options so it's propagated to
     # makeTopology and create_topology the parent scripts