diff --git a/DDTest/src/test_shapes.cc b/DDTest/src/test_shapes.cc
index d08112987fdb35436b98228c8a7380caf134ab60..866b653eaabff99c6caaa39a8426b549ca0de7a9 100644
--- a/DDTest/src/test_shapes.cc
+++ b/DDTest/src/test_shapes.cc
@@ -20,7 +20,7 @@ int main(int /* argc */, char** /* argv */ ){
 
     // add single plane with addZPlanes
     dd4hep::Polycone polycone(0, 2*M_PI, {0, 0}, {1, 1}, {0, 1});
-    polycone.addZPlanes({0}, {1}, {0.5});
+    polycone.addZPlanes({0}, {1}, {2});
 
     // --------------------------------------------------------------------
   }