--- simgear/simgear/canvas/elements/CanvasText.cxx
+++ simgear/simgear/canvas/elements/CanvasText.cxx
@@ -496,7 +496,8 @@
               {
                 case LEFT_TO_RIGHT:
                 {
-                  osg::Vec2 delta( activefont->getKerning( previous_charcode,
+                  osg::Vec2 delta( activefont->getKerning( _fontSize,
+                                                           previous_charcode,
                                                            charcode,
                                                            _kerningType ) );
                   cursor.x() += delta.x() * wr;
@@ -505,7 +506,8 @@
                 }
                 case RIGHT_TO_LEFT:
                 {
-                  osg::Vec2 delta( activefont->getKerning( charcode,
+                  osg::Vec2 delta( activefont->getKerning( _fontSize,
+                                                           charcode,
                                                            previous_charcode,
                                                            _kerningType ) );
                   cursor.x() -= delta.x() * wr;