diff --git a/3rdparty/fonts/fnt.cxx b/3rdparty/fonts/fnt.cxx
index 302caaf..beb842b 100644
--- a/3rdparty/fonts/fnt.cxx
+++ b/3rdparty/fonts/fnt.cxx
@@ -191,14 +191,25 @@ void fntTexFont::getBBox ( const char *s,
       SG_LOG(SG_GUI,SG_ALERT, "UTF8 cc=" << cc);
 
       int x = cc << 4;
+
+      SG_LOG(SG_GUI,SG_ALERT, "UTF8 cc<<4 " << x);
+
+
       cc =  (unsigned char) *(s++) ;
 
-      x= x + (cc<<2) >> 4;
+      SG_LOG(SG_GUI,SG_ALERT, "UTF81 cc=" << cc);
 
-      int y = (cc & 0X03 )<< 6 + (unsigned char) *(s++) & 0X7F;
+      x= x + (cc>>2) & 0x0F;
 
-      cc = x * 256 + y;
-      SG_LOG(SG_GUI,SG_ALERT, "U =" << cc);
+      int y = (cc & 0x03) * 0X3F;
+
+      cc =  (unsigned char) *(s++) ;
+
+      SG_LOG(SG_GUI,SG_ALERT, "UTF82 cc=" << cc);
+
+      y= y + (cc & 0x3F);
+
+      SG_LOG(SG_GUI,SG_ALERT, "x=" << x << ",y=" << y);
     }
 
     if ( ! exists [ cc ] )