diff --git a/src/cpu/o3/impl.hh b/src/cpu/o3/impl.hh
index bc7e408518..b7099301df 100644
--- a/src/cpu/o3/impl.hh
+++ b/src/cpu/o3/impl.hh
@@ -72,7 +72,7 @@ struct O3CPUImpl
 
     enum
     {
-      MaxWidth = 8,
+      MaxWidth = 12,
       MaxThreads = 4
     };
 };