diff --git a/src/arch/arm/pagetable.hh b/src/arch/arm/pagetable.hh
index 9511889a07..b38d28df91 100644
--- a/src/arch/arm/pagetable.hh
+++ b/src/arch/arm/pagetable.hh
@@ -361,6 +361,9 @@ struct TlbEntry : public ReplaceableEntry, Serializable
     /** Need for compliance with the AssociativeCache interface */
     void insert(const Lookup &lookup) {}
 
+    /** Need for compliance with the AssociativeCache interface */
+    bool isValid() const { return valid; }
+
     void
     updateVaddr(Addr new_vaddr)
     {