diff --git a/src/store/naive/store.cpp b/src/store/naive/store.cpp
--- a/src/store/naive/store.cpp
+++ b/src/store/naive/store.cpp
@@ -97,6 +97,8 @@
 ********************************************************************************/
 Store::Store()
   :
+  theEmptyNs(NULL),
+  theXmlSchemaNs(NULL),
   theNumUsers(0),
   theNamespacePool(NULL),
   theQNamePool(NULL),
@@ -124,6 +126,8 @@
 ********************************************************************************/
 Store::~Store()
 {
+	delete theEmptyNs;
+	delete theXmlSchemaNs;
 }
 
 
@@ -145,10 +149,13 @@
 
     store::Properties::load(0, NULL);
 
+    theEmptyNs = new zstring;
+    theXmlSchemaNs = new zstring;
+
     theNamespacePool = new StringPool(NAMESPACE_POOL_SIZE);
 
-    theNamespacePool->insertc("", theEmptyNs);
-    theNamespacePool->insertc(XS_URI, theXmlSchemaNs);
+    theNamespacePool->insertc("", *theEmptyNs);
+    theNamespacePool->insertc(XS_URI, *theXmlSchemaNs);
 
     theQNamePool = new QNamePool(QNamePool::MAX_CACHE_SIZE, theNamespacePool);
 
@@ -333,8 +340,9 @@
 
     if (theNamespacePool != NULL)
     {
-      theEmptyNs.~zstring();
-      theXmlSchemaNs.~zstring();
+      delete theEmptyNs;
+      delete theXmlSchemaNs;
+      theEmptyNs = theXmlSchemaNs = NULL;
 
       delete theNamespacePool;
       theNamespacePool = NULL;
diff --git a/src/store/naive/store.h b/src/store/naive/store.h
--- a/src/store/naive/store.h
+++ b/src/store/naive/store.h
@@ -148,8 +148,8 @@
   static const ulong DEFAULT_INTEGRITY_CONSTRAINT_SET_SIZE;
 
 public:
-  zstring                       theEmptyNs;
-  zstring                       theXmlSchemaNs;
+  zstring                       *theEmptyNs;
+  zstring                       *theXmlSchemaNs;
 
   std::vector<store::Item_t>    theSchemaTypeNames;
   std::map<store::Item*, store::SchemaTypeCode> theSchemaTypeCodes;