1 files changed, 8 insertions, 2 deletions
diff --git a/generic/Geo.c b/generic/Geo.c
index 52ac268..d93c5e9 100644
--- a/generic/Geo.c
+++ b/generic/Geo.c
@@ -439,8 +439,14 @@ ZnAddPointsToBBox(ZnBBox        *bbox,
   }
   bbox->orig.x = x1;
   bbox->orig.y = y1;
-  bbox->corner.x = x2 + 1;
-  bbox->corner.y = y2 + 1;
+  if (x1 == x2) {
+    x2++;
+  }
+  if (y1 == y2) {
+    y2++;
+  }
+  bbox->corner.x = x2;
+  bbox->corner.y = y2;
 }