5 files changed, 10 insertions, 15 deletions

diff --git a/src/model/geometry/density_legend_geometry.c b/src/model/geometry/density_legend_geometry.c
index c437517..e5baa08 100644
--- a/src/model/geometry/density_legend_geometry.c
+++ b/src/model/geometry/density_legend_geometry.c
@@ -47,7 +47,10 @@ density_legend_geometry (void)
    * remains a fixed number of pixels tall when the window is resized
    * or zoomed.
    */
-  double legend_height = (*top - *bottom) / S.viewport.h * 10.0;
+  GLint viewport[4];
+  glGetIntegerv (GL_VIEWPORT, viewport);
+
+  double legend_height = (*top - *bottom) / viewport[3] * 10.0;
 
   a[0] = *left;
   a[1] = *top;