1 files changed, 2 insertions, 1 deletions
diff --git a/vector.hpp b/vector.hpp
index 2e87acd..f642816 100644
--- a/vector.hpp
+++ b/vector.hpp
@@ -1,6 +1,7 @@
 
 #pragma once
 
+#include "mod.hpp"
 #include <eigen3/Eigen/Dense>
 
 template <class T, int D> using Vector = Eigen::Matrix<T, D, 1>;
@@ -9,7 +10,7 @@ template <class T, int D> Vector<T, D> diff(T L, Vector<T, D> v1, Vector<T, D> v
   Vector<T, D> v;
 
   for (unsigned i = 0; i < D; i++) {
-    v(i) = std::abs(v1(i) - v2(i));
+    v(i) = std::abs(mod(v1(i), L) - mod(v2(i), L));
     if (v(i) > L / 2) {
       v(i) = L - v(i);
     }