diff --git a/rogueviz/hypcity.cpp b/rogueviz/hypcity.cpp
index 187fb20e..ad21e0a9 100644
--- a/rogueviz/hypcity.cpp
+++ b/rogueviz/hypcity.cpp
@@ -56,7 +56,7 @@ void prepare_tf() {
       hx[2] = 0;
       hx[3] = 1;
       if(hyperbolic) hx = spin(45 * degree) * hx;
-      normalize(hx);
+      hx = normalize(hx);
       hx = zshift(hx, h[2]*(t*(sphere ? 3 : 7)));
 
       return {0, hx};