diff --git a/io_scene_x3d/export_x3d.py b/io_scene_x3d/export_x3d.py
index 5a8d6a246d0e71d7249fc8adcdd22cbdd2a86726..1b9711b5dbc6af75cecc7853d9dd8c80f72cd146 100644
--- a/io_scene_x3d/export_x3d.py
+++ b/io_scene_x3d/export_x3d.py
@@ -369,7 +369,7 @@ def export(file,
 
         loc, rot, scale = matrix.decompose()
         rot = rot.to_axis_angle()
-        rot = rot[0][:] + (rot[1], )
+        rot = rot[0].normalized()[:] + (rot[1], )
 
         ident_step = ident + (' ' * (-len(ident) + \
         fw('%s<Viewpoint ' % ident)))