diff --git a/configs/sim/README.txt b/configs/sim/README.txt
index bbd2629dd8..cbdfddacae 100644
--- a/configs/sim/README.txt
+++ b/configs/sim/README.txt
@@ -852,7 +852,7 @@ nxwm
      the serial console.  So I do not believe that problem exists and
      I think that the above workaround should no longer be necessary.
      However, I will leave the above text in place until I get then
-     oppotunity to verify that the new UART simulation fixes the problem.
+     opportunity to verify that the new UART simulation fixes the problem.
 
   2019-05-04:  Something has changed.  Today this configuration failed
     to build because is requires CONFIG_NX_XYINPUT=y in the configuration.
diff --git a/libs/libnx/nxglib/nxglib_intersecting.c b/libs/libnx/nxglib/nxglib_intersecting.c
index 3dc425c67f..fe50e58c68 100644
--- a/libs/libnx/nxglib/nxglib_intersecting.c
+++ b/libs/libnx/nxglib/nxglib_intersecting.c
@@ -58,7 +58,8 @@
 bool nxgl_intersecting(FAR const struct nxgl_rect_s *rect1,
                        FAR const struct nxgl_rect_s *rect2)
 {
-  return ((rect1->pt2.x > rect2->pt1.x) && (rect1->pt2.y > rect2->pt1.y) &&
-          (rect1->pt1.x < rect2->pt2.x) && (rect1->pt1.y < rect2->pt1.y));
+  return ((ngl_max(rect1->pt1.x, rect2->pt1.x) <=
+           ngl_min(rect1->pt2.x, rect2->pt2.x)) &&
+          (ngl_max(rect1->pt1.y, rect2->pt1.y) <=
+           ngl_min(rect1->pt2.y, rect2->pt2.y)));
 }
-