diff --git a/src/mem/physical.cc b/src/mem/physical.cc
index 8c56d340f8..a3a9df64e8 100644
--- a/src/mem/physical.cc
+++ b/src/mem/physical.cc
@@ -70,6 +70,10 @@ PhysicalMemory::PhysicalMemory(const Params *p)
         memset(pmemAddr, 0, p->range.size());
 
     pagePtr = 0;
+
+    cachedSize = params()->range.size();
+    cachedStart = params()->range.start;
+
 }
 
 void
diff --git a/src/mem/physical.hh b/src/mem/physical.hh
index b06cc90f83..c3749bd5bc 100644
--- a/src/mem/physical.hh
+++ b/src/mem/physical.hh
@@ -149,10 +149,12 @@ class PhysicalMemory : public MemObject
     std::vector<MemoryPort*> ports;
     typedef std::vector<MemoryPort*>::iterator PortIterator;
 
+    uint64_t cachedSize;
+    uint64_t cachedStart;
   public:
     Addr new_page();
-    uint64_t size() { return params()->range.size(); }
-    uint64_t start() { return params()->range.start; }
+    uint64_t size() { return cachedSize; }
+    uint64_t start() { return cachedStart; }
 
   public:
     typedef PhysicalMemoryParams Params;