diff --git a/test/algorithms/expand_on_spheroid.cpp b/test/algorithms/expand_on_spheroid.cpp
index 147723f14..40426469d 100644
--- a/test/algorithms/expand_on_spheroid.cpp
+++ b/test/algorithms/expand_on_spheroid.cpp
@@ -715,7 +715,7 @@ BOOST_AUTO_TEST_CASE( expand_segment_with_height )
     tester::apply("sh01",
                   from_wkt<B>("BOX(20 20 100,50 50 1000)"),
                   from_wkt<G>("SEGMENT(10 10 150,40 40 500)"),
-                  10, 10, 100, 50, 50, 1001);
+                  10, 10, 100, 50, 50, 1000);
 
     tester::apply("sh02",
                   from_wkt<B>("BOX(20 20 100,50 50 1000)"),