diff --git a/compiler/utils/assembler_test.h b/compiler/utils/assembler_test.h
index 084e901..afe0576 100644
--- a/compiler/utils/assembler_test.h
+++ b/compiler/utils/assembler_test.h
@@ -461,7 +461,7 @@
 
   void SetUp() OVERRIDE {
     arena_.reset(new ArenaAllocator(&pool_));
-    assembler_.reset(new (arena_.get()) Ass(arena_.get()));
+    assembler_.reset(CreateAssembler(arena_.get()));
     test_helper_.reset(
         new AssemblerTestInfrastructure(GetArchitectureString(),
                                         GetAssemblerCmdName(),
@@ -481,6 +481,11 @@
     arena_.reset();
   }
 
+  // Override this to set up any architecture-specific things, e.g., CPU revision.
+  virtual Ass* CreateAssembler(ArenaAllocator* arena) {
+    return new (arena) Ass(arena);
+  }
+
   // Override this to set up any architecture-specific things, e.g., register vectors.
   virtual void SetUpHelpers() {}