diff --git a/plugins/MRCC_Utils/davidson.irp.f b/plugins/MRCC_Utils/davidson.irp.f
index 9216877c..f1cff31a 100644
--- a/plugins/MRCC_Utils/davidson.irp.f
+++ b/plugins/MRCC_Utils/davidson.irp.f
@@ -577,7 +577,7 @@ subroutine H_u_0_mrcc(v_0,u_0,H_jj,n,keys_tmp,Nint,istate)
         do ni=1,Nint
           ext += popcnt(xor(sorted(ni,i), sorted(ni,j)))
         end do
-        if(ext <= 4) then
+        if(ext == 4) then
           org_i = sort_idx(i)
           org_j = sort_idx(j)
           call i_H_j(keys_tmp(1,1,org_j),keys_tmp(1,1,org_i),Nint,hij)
diff --git a/src/Determinants/s2.irp.f b/src/Determinants/s2.irp.f
index c11b2161..252810f3 100644
--- a/src/Determinants/s2.irp.f
+++ b/src/Determinants/s2.irp.f
@@ -189,7 +189,7 @@ subroutine get_s2_u0(psi_keys_tmp,psi_coefs_tmp,n,nmax,s2)
         do ni=1,N_int
           ext += popcnt(xor(sorted(ni,i), sorted(ni,j)))
         end do
-        if(ext <= 4) then
+        if(ext == 4) then
           org_i = sort_idx(i)
           org_j = sort_idx(j)