diff --git a/src/mem/slicc/parser.py b/src/mem/slicc/parser.py
--- a/src/mem/slicc/parser.py
+++ b/src/mem/slicc/parser.py
@@ -259,11 +259,11 @@
         p[0] = self.parse_file(filename)
 
     def p_decl__machine0(self, p):
-        "decl : MACHINE '(' idents ')' ':' obj_decls '{' decls '}'"
+        "decl : MACHINE '(' ident ')' ':' obj_decls '{' decls '}'"
         p[0] = ast.MachineAST(self, p[3], [], p[7], p[9])
 
     def p_decl__machine1(self, p):
-        "decl : MACHINE '(' idents pairs ')' ':' obj_decls '{' decls '}'"
+        "decl : MACHINE '(' ident pairs ')' ':' obj_decls '{' decls '}'"
         p[0] = ast.MachineAST(self, p[3], p[4], p[7], p[9])
 
     def p_decl__action(self, p):
# Node ID b3daf37c5620a05d9f8e5e90aec59b7b9d825c56
# Parent  a9868b18de7a1416af24e6111b7d27dc60935c42
diff --git a/src/mem/slicc/ast/MachineAST.py b/src/mem/slicc/ast/MachineAST.py
--- a/src/mem/slicc/ast/MachineAST.py
+++ b/src/mem/slicc/ast/MachineAST.py
@@ -29,11 +29,10 @@
 from slicc.symbols import StateMachine, Type
 
 class MachineAST(DeclAST):
-    def __init__(self, slicc, idents, pairs_ast, config_parameters, decls):
+    def __init__(self, slicc, ident, pairs_ast, config_parameters, decls):
         super(MachineAST, self).__init__(slicc, pairs_ast)
 
-        self.ident = idents[0]
-        self.machine_types = idents
+        self.ident = ident
         self.pairs_ast = pairs_ast
         self.config_parameters = config_parameters
         self.decls = decls
@@ -71,19 +70,13 @@
         self.symtab.popFrame()
 
     def findMachines(self):
-        # Add to MachineType enumeration
-        for mtype in self.machine_types:
-            machine_type = self.symtab.find("MachineType", Type)
-            pairs = self.pairs_ast.pairs
+        mtype = self.ident
+        machine_type = self.symtab.find("MachineType", Type)
+        pairs = self.pairs_ast.pairs
 
-            if mtype == self.ident:
-                pairs["Primary"] = True
-            else:
-                pairs["Primary"] = False
-
-            if not machine_type.addEnum(mtype, pairs):
-                self.error("Duplicate machine name: %s:%s" % (
-                            machine_type, mtype))
+        pairs["Primary"] = True
+        if not machine_type.addEnum(mtype, pairs):
+            self.error("Duplicate machine name: %s:%s" % (machine_type, mtype))
 
         # Generate code for all the internal decls
         self.decls.findMachines()