diff --git a/src/Input/input.cxx b/src/Input/input.cxx
index c6540efd1..59f27bd89 100644
--- a/src/Input/input.cxx
+++ b/src/Input/input.cxx
@@ -319,8 +319,8 @@ FGInput::doMouseClick (int b, int updown, int x, int y)
       // and be happy.
       FGScenery* scenery = globals->get_scenery();
       sgdVec3 start, dir, hit;
-      if (MOUSE_BUTTON_DOWN && FGRenderer::getPickInfo(start, dir, x, y) &&
-          scenery->get_cart_ground_intersection(start, dir, hit)) {
+      if (updown == MOUSE_BUTTON_DOWN && FGRenderer::getPickInfo(start, dir, x, y)
+          && scenery->get_cart_ground_intersection(start, dir, hit)) {
 
         Point3D geod = sgCartToGeod(Point3D(hit[0], hit[1], hit[2]));