diff --git a/include/osgDB/Serializer b/include/osgDB/Serializer
index 87c55ef68..4eea99d7e 100644
--- a/include/osgDB/Serializer
+++ b/include/osgDB/Serializer
@@ -58,6 +58,18 @@ public:
         _stringToValue[str] = value;
     }
 
+    void add2(const char* str, const char* newStr, Value value) {
+        if (_valueToString.find(value) != _valueToString.end())
+        {
+            osg::notify(osg::INFO) << "Duplicate enum value " << value
+                << " with old string: " << _valueToString[value]
+                << " and new strings: " << str  << " and " << newStr << std::endl;
+        }
+        _valueToString[value] = newStr;
+        _stringToValue[newStr] = value;
+        _stringToValue[str] = value;
+    }
+
     Value getValue( const char* str )
     {
         StringToValue::iterator itr = _stringToValue.find(str);
diff --git a/src/osgDB/ObjectWrapper.cpp b/src/osgDB/ObjectWrapper.cpp
index ef0d8eab0..01d2eebc1 100644
--- a/src/osgDB/ObjectWrapper.cpp
+++ b/src/osgDB/ObjectWrapper.cpp
@@ -696,15 +696,10 @@ ObjectWrapperManager::ObjectWrapperManager()
     primitiveTable.add( "GL_QUAD_STRIP", GL_QUAD_STRIP );
     primitiveTable.add( "GL_POLYGON", GL_POLYGON );
 
-    primitiveTable.add( "GL_LINES_ADJACENCY_EXT", GL_LINES_ADJACENCY_EXT );
-    primitiveTable.add( "GL_LINE_STRIP_ADJACENCY_EXT", GL_LINE_STRIP_ADJACENCY_EXT );
-    primitiveTable.add( "GL_TRIANGLES_ADJACENCY_EXT", GL_TRIANGLES_ADJACENCY_EXT );
-    primitiveTable.add( "GL_TRIANGLE_STRIP_ADJACENCY_EXT", GL_TRIANGLE_STRIP_ADJACENCY_EXT );
-
-    primitiveTable.add( "GL_LINES_ADJACENCY", GL_LINES_ADJACENCY );
-    primitiveTable.add( "GL_LINE_STRIP_ADJACENCY", GL_LINE_STRIP_ADJACENCY );
-    primitiveTable.add( "GL_TRIANGLES_ADJACENCY", GL_TRIANGLES_ADJACENCY );
-    primitiveTable.add( "GL_TRIANGLE_STRIP_ADJACENCY", GL_TRIANGLE_STRIP_ADJACENCY );
+    primitiveTable.add2("GL_LINES_ADJACENCY_EXT", "GL_LINES_ADJACENCY", GL_LINES_ADJACENCY );
+    primitiveTable.add2("GL_LINE_STRIP_ADJACENCY_EXT", "GL_LINE_STRIP_ADJACENCY", GL_LINE_STRIP_ADJACENCY );
+    primitiveTable.add2("GL_TRIANGLES_ADJACENCY_EXT", "GL_TRIANGLES_ADJACENCY", GL_TRIANGLES_ADJACENCY );
+    primitiveTable.add2("GL_TRIANGLE_STRIP_ADJACENCY_EXT", "GL_TRIANGLE_STRIP_ADJACENCY", GL_TRIANGLE_STRIP_ADJACENCY );
 
     primitiveTable.add( "GL_PATCHES", GL_PATCHES );
 }