diff --git a/include/osg/PrimitiveSet b/include/osg/PrimitiveSet
index 08ed74399..a49f1809e 100644
--- a/include/osg/PrimitiveSet
+++ b/include/osg/PrimitiveSet
@@ -185,23 +185,7 @@ class PrimitiveSet : public Object
         virtual unsigned int getNumIndices() const = 0;
         virtual void offsetIndices(int offset) = 0;
 
-        virtual unsigned int getNumPrimitives() const 
-        {
-            switch(_mode)
-            {
-                case(POINTS): return getNumIndices();
-                case(LINES): return getNumIndices()/2;
-                case(TRIANGLES): return getNumIndices()/3;
-                case(QUADS): return getNumIndices()/4;
-                case(LINE_STRIP):
-                case(LINE_LOOP):
-                case(TRIANGLE_STRIP):
-                case(TRIANGLE_FAN):
-                case(QUAD_STRIP):
-                case(POLYGON): return 1;
-            }
-            return 0;
-        }
+        virtual unsigned int getNumPrimitives() const; 
 
         /** Dirty the primitive, which increments the modified count, to force buffer objects to update. */
         inline void dirty() { ++_modifiedCount; }      
@@ -356,23 +340,7 @@ class OSG_EXPORT DrawArrayLengths : public PrimitiveSet, public VectorGLsizei
         virtual unsigned int index(unsigned int pos) const { return _first+pos; }
         virtual void offsetIndices(int offset) { _first += offset; }
 
-        virtual unsigned int getNumPrimitives() const 
-        {
-            switch(_mode)
-            {
-                case(POINTS): return getNumIndices();
-                case(LINES): return getNumIndices()/2;
-                case(TRIANGLES): return getNumIndices()/3;
-                case(QUADS): return getNumIndices()/4;
-                case(LINE_STRIP):
-                case(LINE_LOOP):
-                case(TRIANGLE_STRIP):
-                case(TRIANGLE_FAN):
-                case(QUAD_STRIP):
-                case(POLYGON): return size();
-            }
-            return 0;
-        }
+        virtual unsigned int getNumPrimitives() const;
 
     protected:
 
diff --git a/src/osg/PrimitiveSet.cpp b/src/osg/PrimitiveSet.cpp
index d5e3e9f59..4fcc33ea8 100644
--- a/src/osg/PrimitiveSet.cpp
+++ b/src/osg/PrimitiveSet.cpp
@@ -17,6 +17,24 @@
 
 using namespace osg;
 
+unsigned int PrimitiveSet::getNumPrimitives() const
+{
+    switch(_mode)
+    {
+        case(POINTS): return getNumIndices();
+        case(LINES): return getNumIndices()/2;
+        case(TRIANGLES): return getNumIndices()/3;
+        case(QUADS): return getNumIndices()/4;
+        case(LINE_STRIP):
+        case(LINE_LOOP):
+        case(TRIANGLE_STRIP):
+        case(TRIANGLE_FAN):
+        case(QUAD_STRIP):
+        case(POLYGON): return 1;
+    }
+    return 0;
+}
+
 void DrawArrays::draw(State&, bool) const 
 {
     glDrawArrays(_mode,_first,_count);
@@ -32,6 +50,24 @@ void DrawArrays::accept(PrimitiveIndexFunctor& functor) const
     functor.drawArrays(_mode,_first,_count);
 }
 
+unsigned int DrawArrayLengths::getNumPrimitives() const
+{
+    switch(_mode)
+    {
+        case(POINTS): return getNumIndices();
+        case(LINES): return getNumIndices()/2;
+        case(TRIANGLES): return getNumIndices()/3;
+        case(QUADS): return getNumIndices()/4;
+        case(LINE_STRIP):
+        case(LINE_LOOP):
+        case(TRIANGLE_STRIP):
+        case(TRIANGLE_FAN):
+        case(QUAD_STRIP):
+        case(POLYGON): return size();
+    }
+    return 0;
+}
+
 void DrawArrayLengths::draw(State&, bool) const
 {
     GLint first = _first;