diff --git a/nonisotropic.cpp b/nonisotropic.cpp
index 365e024d..88a97e68 100644
--- a/nonisotropic.cpp
+++ b/nonisotropic.cpp
@@ -2629,7 +2629,7 @@ EX namespace twist {
 
     shiftmatrix T(rgpushxto0(h1.h), h1.shift);
 
-    shiftpoint h = nmul(rots::ninverse(T), h2);
+    shiftpoint h = nmul(ninverse(T), h2);
 
     hyperpoint z = inverse_exp(h);