diff --git a/hypgraph.cpp b/hypgraph.cpp
index f8c6d890..c9cfc8e5 100644
--- a/hypgraph.cpp
+++ b/hypgraph.cpp
@@ -213,7 +213,7 @@ ld find_zlev(hyperpoint& H) {
 
   if(spatial_graphics) {
     ld zlev = zlevel(H);
-    if(zlev > 1-1e-6 && zlev < 1+1e-6) return 1;
+    if(zlev > 1-1e-9 && zlev < 1+1e-9) return 1;
     H /= zlev;
     return zlev;
     }