diff --git a/src/sisl/geom/flat.py b/src/sisl/geom/flat.py
index 3e55fdddd..598aae276 100644
--- a/src/sisl/geom/flat.py
+++ b/src/sisl/geom/flat.py
@@ -102,8 +102,8 @@ def _minimal_op(shells):
         # the next horizontal lines.
 
         # Displacement from the end of one horizontal pair to the beggining of the next
-        branch_displ_x = bond * np.cos(np.radians(60))
-        branch_displ_y = bond * np.sin(np.radians(60))
+        branch_displ_x = bond * 0.5 # cos(60) = 0.5
+        branch_displ_y = bond * 3 ** 0.5 / 2 # sin(60) = sqrt(3)/2
 
         # Iterate over shells. We also keep track of the atom types, in case
         # we have two different atoms in the honeycomb lattice.