diff --git a/include/osgText/Font b/include/osgText/Font
index c9a561b4d..4a038276c 100644
--- a/include/osgText/Font
+++ b/include/osgText/Font
@@ -26,6 +26,8 @@
 #include <osgDB/ReaderWriter>
 #include <osgText/Export>
 
+#include <OpenThreads/Mutex>
+
 namespace osgText {
 
 class Font;
@@ -159,6 +161,11 @@ public:
        * for all graphics contexts. */
     virtual void releaseGLObjects(osg::State* state=0) const;
 
+    typedef OpenThreads::Mutex FontMutex;
+    
+    /** Get the mutex that enables the serialization of calls to this font.*/
+    FontMutex& getSerializeFontCallsMutex() const { return _serializeFontCallsMutex; }
+
 protected:
 
     virtual ~Font();
@@ -172,6 +179,7 @@ protected:
     typedef std::pair< unsigned int, unsigned int >         SizePair;
     typedef std::map< SizePair, GlyphMap >                  SizeGlyphMap;
     
+    mutable FontMutex               _serializeFontCallsMutex;
 
     osg::ref_ptr<osg::TexEnv>       _texenv;
     osg::ref_ptr<osg::StateSet>     _stateset;
diff --git a/src/osgText/Text.cpp b/src/osgText/Text.cpp
index 3b30e9555..416e7d256 100644
--- a/src/osgText/Text.cpp
+++ b/src/osgText/Text.cpp
@@ -448,6 +448,7 @@ String::iterator Text::computeLastCharacterOnLine(osg::Vec2& cursor, String::ite
     return lastChar;
 }
 
+
 void Text::computeGlyphRepresentation()
 {
     Font* activefont = getActiveFont();
@@ -462,6 +463,8 @@ void Text::computeGlyphRepresentation()
         computePositions(); //to reset the origin
         return;
     }
+    
+    OpenThreads::ScopedLock<Font::FontMutex> lock(activefont->getSerializeFontCallsMutex());
 
     // initialize bounding box, it will be expanded during glyph position calculation
     _textBB.init();