diff --git a/src/factory/PVStructure.cpp b/src/factory/PVStructure.cpp
index 6057d78..b24c553 100644
--- a/src/factory/PVStructure.cpp
+++ b/src/factory/PVStructure.cpp
@@ -24,25 +24,6 @@ using std::string;
 
 namespace epics { namespace pvData {
 
-PVFieldPtr PVStructure::nullPVField;
-PVBooleanPtr PVStructure::nullPVBoolean;
-PVBytePtr PVStructure::nullPVByte;
-PVShortPtr PVStructure::nullPVShort;
-PVIntPtr PVStructure::nullPVInt;
-PVLongPtr PVStructure::nullPVLong;
-PVUBytePtr PVStructure::nullPVUByte;
-PVUShortPtr PVStructure::nullPVUShort;
-PVUIntPtr PVStructure::nullPVUInt;
-PVULongPtr PVStructure::nullPVULong;
-PVFloatPtr PVStructure::nullPVFloat;
-PVDoublePtr PVStructure::nullPVDouble;
-PVStringPtr PVStructure::nullPVString;
-PVStructurePtr PVStructure::nullPVStructure;
-PVStructureArrayPtr PVStructure::nullPVStructureArray;
-PVUnionPtr PVStructure::nullPVUnion;
-PVUnionArrayPtr PVStructure::nullPVUnionArray;
-PVScalarArrayPtr PVStructure::nullPVScalarArray;
-
 PVStructure::PVStructure(StructureConstPtr const & structurePtr)
 : PVField(structurePtr),
   structurePtr(structurePtr),
@@ -116,9 +97,9 @@ PVFieldPtr  PVStructure::getSubField(const char * fieldName) const
 PVFieldPtr  PVStructure::getSubField(size_t fieldOffset) const
 {
     if(fieldOffset<=getFieldOffset()) {
-        return nullPVField;
+        return PVFieldPtr();
     }
-    if(fieldOffset>getNextFieldOffset()) return nullPVField;
+    if(fieldOffset>getNextFieldOffset()) return PVFieldPtr();
     size_t numFields = pvFields.size();
     for(size_t i=0; i<numFields; i++) {
         PVFieldPtr pvField  = pvFields[i];
diff --git a/src/pv/pvData.h b/src/pv/pvData.h
index b64f8ae..3f12250 100644
--- a/src/pv/pvData.h
+++ b/src/pv/pvData.h
@@ -916,25 +916,6 @@ public:
 private:
     PVField *getSubFieldImpl(const char *name, bool throws = true) const;
 
-    static PVFieldPtr nullPVField;
-    static PVBooleanPtr nullPVBoolean;
-    static PVBytePtr nullPVByte;
-    static PVShortPtr nullPVShort;
-    static PVIntPtr nullPVInt;
-    static PVLongPtr nullPVLong;
-    static PVUBytePtr nullPVUByte;
-    static PVUShortPtr nullPVUShort;
-    static PVUIntPtr nullPVUInt;
-    static PVULongPtr nullPVULong;
-    static PVFloatPtr nullPVFloat;
-    static PVDoublePtr nullPVDouble;
-    static PVStringPtr nullPVString;
-    static PVStructurePtr nullPVStructure;
-    static PVStructureArrayPtr nullPVStructureArray;
-    static PVUnionPtr nullPVUnion;
-    static PVUnionArrayPtr nullPVUnionArray;
-    static PVScalarArrayPtr nullPVScalarArray;
-
     PVFieldPtrArray pvFields;
     StructureConstPtr structurePtr;
     std::string extendsStructureName;