diff --git a/src/core/Matrix.c b/src/core/Matrix.c
index d2e5f613..afadfba4 100644
--- a/src/core/Matrix.c
+++ b/src/core/Matrix.c
@@ -111,11 +111,13 @@ Matrix *matrix_new_no_extra_space(const double *Ax, const int *Ai, const int *Ap
     memcpy(A->x, Ax, nnz * sizeof(double));
     memcpy(A->i, Ai, nnz * sizeof(int));
 
-    for (int i = 0; i <= n_rows; ++i)
+    for (int i = 0; i < n_rows; ++i)
     {
         A->p[i].start = Ap[i];
         A->p[i].end = Ap[i + 1];
     }
+    A->p[n_rows].start = Ap[n_rows];
+    A->p[n_rows].end = Ap[n_rows];
 
     /* the presolver assumes that only nonzero entries are stored */
     remove_explicit_zeros(A);