diff --git a/src/fourier/fft/fftw_calls_mpi.hpp b/src/fourier/fft/fftw_calls_mpi.hpp
index 1b14128..7a4cf0c 100644
--- a/src/fourier/fft/fftw_calls_mpi.hpp
+++ b/src/fourier/fft/fftw_calls_mpi.hpp
@@ -33,6 +33,11 @@ public: \
   static real_type *alloc_real(size_t N) { return prefix ## _alloc_real(N); } \
   static void free(void *p) { fftw_free(p); } \
 \
+  template<size_t Nd> \
+  static ptrdiff_t local_size(std::array<ptrdiff_t,Nd> const& N, MPI_Comm comm, \
+                              ptrdiff_t *local_n0, ptrdiff_t *local_0_start) { \
+    return prefix ## _mpi_local_size(Nd, N.data(), comm, local_n0, local_0_start); \
+  } \
   static ptrdiff_t local_size_2d(ptrdiff_t N0, ptrdiff_t N1, MPI_Comm comm, \
                                 ptrdiff_t *local_n0, ptrdiff_t *local_0_start) { \
     return prefix ## _mpi_local_size_2d(N0, N1, comm, local_n0, local_0_start); \