diff --git a/src/fourier/details/euclidian_transform.hpp b/src/fourier/details/euclidian_transform.hpp
index b533227..8faba32 100644
--- a/src/fourier/details/euclidian_transform.hpp
+++ b/src/fourier/details/euclidian_transform.hpp
@@ -163,7 +163,7 @@ namespace CosmoTool
     template<typename T2>
     static std::vector<T2> make_3d_vector(T2 a, T2 b, T2 c)
     {
-      T2 arr[2] = { a, b, c};
+      T2 arr[3] = { a, b, c};
       return std::vector<T2>(&arr[0], &arr[3]);
     }