diff --git a/crystal.cpp b/crystal.cpp
index b3336630..732a506b 100644
--- a/crystal.cpp
+++ b/crystal.cpp
@@ -686,8 +686,8 @@ struct hrmap_crystal : hrmap_standard {
     }
 
   transmatrix relative_matrixh(heptagon *h2, heptagon *h1, const hyperpoint& hint) override { 
-    if(!crystal3()) return hrmap::relative_matrixh(h2, h1, hint);
-    return relative_matrix(h2->c7, h1->c7, hint);
+    if(!crystal3()) return hrmap_standard::relative_matrixh(h2, h1, hint);
+    return relative_matrixc(h2->c7, h1->c7, hint);
     }
   #endif
   };