diff --git a/crystal.cpp b/crystal.cpp
index 16cccdc0..5e7de815 100644
--- a/crystal.cpp
+++ b/crystal.cpp
@@ -605,6 +605,8 @@ EX heptagon *get_heptagon_at(coord c) { return crystal_map()->get_heptagon_at(c,
 EX coord get_coord(heptagon *h) { return crystal_map()->hcoords[h]; }
 EX ldcoord get_ldcoord(cell *c) { return crystal_map()->get_coord(c); }
 
+EX int get_dim() { retrun crystal_map()->cs.dim; }
+
 #if MAXMDIM >= 4
 EX transmatrix get_adj(heptagon *h, int d) { return crystal_map()->adj(h, d); }
 #endif