diff --git a/src/mem/protocol/RubySlicc_Exports.sm b/src/mem/protocol/RubySlicc_Exports.sm
index e0371f8969..4162800c57 100644
--- a/src/mem/protocol/RubySlicc_Exports.sm
+++ b/src/mem/protocol/RubySlicc_Exports.sm
@@ -169,8 +169,7 @@ enumeration(MemoryControlRequestType, desc="...", default="MemoryControlRequestT
 }
 
 // MessageSizeType
-enumeration(MessageSizeType, default="MessageSizeType_Undefined", desc="...") {
-  Undefined,  desc="Undefined";
+enumeration(MessageSizeType, desc="...") {
   Control,    desc="Control Message";
   Data,       desc="Data Message";
   Request_Control, desc="Request";
diff --git a/src/mem/ruby/network/Network.cc b/src/mem/ruby/network/Network.cc
index c90f27c358..d39e6e1e88 100644
--- a/src/mem/ruby/network/Network.cc
+++ b/src/mem/ruby/network/Network.cc
@@ -71,9 +71,6 @@ uint32_t
 Network::MessageSizeType_to_int(MessageSizeType size_type)
 {
     switch(size_type) {
-      case MessageSizeType_Undefined:
-        panic("Can't convert Undefined MessageSizeType to integer");
-        break;
       case MessageSizeType_Control:
       case MessageSizeType_Request_Control:
       case MessageSizeType_Reissue_Control: