diff --git a/src/bi_ort_ints/semi_num_ints_mo.irp.f b/src/bi_ort_ints/semi_num_ints_mo.irp.f
index 89098676..a548ee62 100644
--- a/src/bi_ort_ints/semi_num_ints_mo.irp.f
+++ b/src/bi_ort_ints/semi_num_ints_mo.irp.f
@@ -178,8 +178,8 @@ BEGIN_PROVIDER [ double precision, int2_grad1_u12_ao_t, (n_points_final_grid, 3,
   integer :: i, j, ipoint
 
   do ipoint = 1, n_points_final_grid
-    do i = 1, mo_num
-      do j = 1, mo_num
+    do i = 1, ao_num
+      do j = 1, ao_num
         int2_grad1_u12_ao_t(ipoint,1,j,i) = int2_grad1_u12_ao(1,j,i,ipoint)
         int2_grad1_u12_ao_t(ipoint,2,j,i) = int2_grad1_u12_ao(2,j,i,ipoint)
         int2_grad1_u12_ao_t(ipoint,3,j,i) = int2_grad1_u12_ao(3,j,i,ipoint)