diff --git a/src/restrictions_zero.cpp b/src/restrictions_zero.cpp
index ea37764..b0509a8 100644
--- a/src/restrictions_zero.cpp
+++ b/src/restrictions_zero.cpp
@@ -35,8 +35,7 @@ arma::colvec zero_restrictions(
 ) {
   int N  = Z(0).n_cols;
   
-  mat A0 = vec_structural.rows(0, N * N - 1);
-  A0     = reshape(A0, N, N);
+  mat A0 = reshape(vec_structural.rows(0, N * N - 1), N, N);
   
   arma::field<arma::mat> ZF = ZIRF(Z, inv(A0.t()));