diff --git a/common.jl b/common.jl
index b7035db..6a95d8a 100644
--- a/common.jl
+++ b/common.jl
@@ -47,7 +47,7 @@ which_index(s::system, dim::Int, coord::Int)::Int = (dim - 1) * (s.n - 1) + coor
 function nearest(s::system, Δk::Int)::Int
     # TODO: Optimize
     while true
-        if Δk > (s.N ÷ 2 - 1)
+        if Δk >= s.N ÷ 2
             Δk -= s.N
         elseif Δk < -s.N ÷ 2
             Δk += s.N