diff --git a/configs/ruby/CHI_config.py b/configs/ruby/CHI_config.py
index a95efec16f..25d4f0575e 100644
--- a/configs/ruby/CHI_config.py
+++ b/configs/ruby/CHI_config.py
@@ -183,6 +183,16 @@ class OrderedTriggerMessageBuffer(TriggerMessageBuffer):
     ordered = True
 
 
+class MemCtrlMessageBuffer(MessageBuffer):
+    """
+    MessageBuffer exchanging messages with the memory
+    These buffers should also not be affected by the Ruby tester randomization.
+    """
+
+    randomization = "disabled"
+    ordered = True
+
+
 class CHI_Cache_Controller(Cache_Controller):
     """
     Default parameters for a Cache controller
@@ -667,8 +677,8 @@ class CHI_SNF_Base(CHI_Node):
             version=Versions.getVersion(Memory_Controller),
             ruby_system=ruby_system,
             triggerQueue=TriggerMessageBuffer(),
-            responseFromMemory=MessageBuffer(),
-            requestToMemory=MessageBuffer(ordered=True),
+            responseFromMemory=MemCtrlMessageBuffer(),
+            requestToMemory=MemCtrlMessageBuffer(),
             reqRdy=TriggerMessageBuffer(),
             transitions_per_cycle=1024,
         )
diff --git a/src/python/gem5/components/cachehierarchies/chi/nodes/memory_controller.py b/src/python/gem5/components/cachehierarchies/chi/nodes/memory_controller.py
index 4d0589499d..bee5e8887f 100644
--- a/src/python/gem5/components/cachehierarchies/chi/nodes/memory_controller.py
+++ b/src/python/gem5/components/cachehierarchies/chi/nodes/memory_controller.py
@@ -37,6 +37,16 @@ from m5.objects import (
 from .abstract_node import TriggerMessageBuffer
 
 
+class MemCtrlMessageBuffer(MessageBuffer):
+    """
+    MessageBuffer exchanging messages with the memory
+    These buffers should also not be affected by the Ruby tester randomization.
+    """
+
+    randomization = "disabled"
+    ordered = True
+
+
 class MemoryController(Memory_Controller):
     """A controller that connects to memory"""
 
@@ -62,8 +72,8 @@ class MemoryController(Memory_Controller):
 
     def connectQueues(self, network):
         self.triggerQueue = TriggerMessageBuffer()
-        self.responseFromMemory = MessageBuffer()
-        self.requestToMemory = MessageBuffer(ordered=True)
+        self.responseFromMemory = MemCtrlMessageBuffer()
+        self.requestToMemory = MemCtrlMessageBuffer()
         self.reqRdy = TriggerMessageBuffer()
 
         self.reqOut = MessageBuffer()