diff --git a/src/arch/generic/mmu.hh b/src/arch/generic/mmu.hh
index 79e53dcf45..d7c048c8eb 100644
--- a/src/arch/generic/mmu.hh
+++ b/src/arch/generic/mmu.hh
@@ -61,7 +61,7 @@ class BaseMMU : public SimObject
     }
 
   public:
-    void
+    virtual void
     flushAll()
     {
         dtb->flushAll();