diff --git a/include/osg/BufferObject b/include/osg/BufferObject
index 37ae19a55..3e627cf95 100644
--- a/include/osg/BufferObject
+++ b/include/osg/BufferObject
@@ -152,6 +152,14 @@ class BufferObjectProfile
 class GLBufferObjectSet;
 class GLBufferObjectManager;
 
+inline unsigned int computeBufferAlignment(unsigned int pos, unsigned int bufferAlignment)
+{
+    if (bufferAlignment<2) return pos;
+    if ((pos%bufferAlignment)==0) return pos;
+    return ((pos/bufferAlignment)+1)*bufferAlignment;
+}
+
+
 class OSG_EXPORT GLBufferObject : public GraphicsObject
 {
     public:
@@ -235,9 +243,7 @@ class OSG_EXPORT GLBufferObject : public GraphicsObject
 
         unsigned int computeBufferAlignment(unsigned int pos, unsigned int bufferAlignment) const
         {
-            if (bufferAlignment<2) return pos;
-            if ((pos%bufferAlignment)==0) return pos;
-            return ((pos/bufferAlignment)+1)*bufferAlignment;
+            return osg::computeBufferAlignment(pos, bufferAlignment);
         }
 
         unsigned int            _contextID;
diff --git a/src/osg/BufferObject.cpp b/src/osg/BufferObject.cpp
index 46fa4e869..d098cfcf3 100644
--- a/src/osg/BufferObject.cpp
+++ b/src/osg/BufferObject.cpp
@@ -140,7 +140,7 @@ void GLBufferObject::compileBuffer()
                 entry.dataSource != bd ||
                 entry.dataSize != bd->getTotalDataSize())
             {
-                unsigned int previousEndOfBufferDataMarker = computeBufferAlignment(entry.offset + entry.dataSize, bufferAlignment);
+                unsigned int previousEndOfBufferDataMarker = osg::computeBufferAlignment(entry.offset + entry.dataSize, bufferAlignment);
 
                 // OSG_NOTICE<<"GLBufferObject::compileBuffer(..) updating BufferEntry"<<std::endl;
 
@@ -158,7 +158,7 @@ void GLBufferObject::compileBuffer()
             }
             else
             {
-                newTotalSize = computeBufferAlignment(newTotalSize + entry.dataSize, bufferAlignment);
+                newTotalSize = osg::computeBufferAlignment(newTotalSize + entry.dataSize, bufferAlignment);
             }
         }
         else
@@ -1188,13 +1188,14 @@ void BufferObject::removeBufferData(BufferData* bd)
 
 unsigned int BufferObject::computeRequiredBufferSize() const
 {
+    unsigned int bufferAlignment = 4;
     unsigned int newTotalSize = 0;
     for(BufferDataList::const_iterator itr = _bufferDataList.begin();
         itr != _bufferDataList.end();
         ++itr)
     {
         BufferData* bd = *itr;
-        if (bd) newTotalSize += bd->getTotalDataSize();
+        if (bd) newTotalSize = osg::computeBufferAlignment(newTotalSize + bd->getTotalDataSize(), bufferAlignment);
         else
         {
             OSG_NOTICE<<"BufferObject::"<<this<<":"<<className()<<"::BufferObject::computeRequiredBufferSize() error, BufferData is 0x0"<<std::endl;