diff --git a/hypgraph.cpp b/hypgraph.cpp
index ac415b32..1f67dcad 100644
--- a/hypgraph.cpp
+++ b/hypgraph.cpp
@@ -968,6 +968,7 @@ EX bool confusingGeometry() {
 
 EX ld master_to_c7_angle() {
   if(hybri) return hybrid::in_underlying_geometry(master_to_c7_angle);
+  if(WDIM == 3) return 0;
   ld alpha = 0;
   #if CAP_GP
   if(cgi.gpdata) alpha = cgi.gpdata->alpha;