diff --git a/apps/griffin b/apps/griffin
index a2e3bc53a..a8652188a 160000
--- a/apps/griffin
+++ b/apps/griffin
@@ -1 +1 @@
-Subproject commit a2e3bc53a86a9a6f3d9d9a276f5e3743ce5dd0b1
+Subproject commit a8652188abaf5a890df56d37c55ea394423d6055
diff --git a/htgr/pbmr400/transient/oecd_pbmr400_tr0_pplofc_rsnk_keff_calc.i b/htgr/pbmr400/transient/oecd_pbmr400_tr0_pplofc_rsnk_keff_calc.i
index 722b9d3f8..49cc4f74e 100755
--- a/htgr/pbmr400/transient/oecd_pbmr400_tr0_pplofc_rsnk_keff_calc.i
+++ b/htgr/pbmr400/transient/oecd_pbmr400_tr0_pplofc_rsnk_keff_calc.i
@@ -691,6 +691,7 @@ fis_fract            = ${fparse 1 - dh_fract} # Fission power fraction at t = 0.
   type = Transient
 
   scheme = implicit-euler
+  use_pre_SMO_residual = true
 
   # end_time = 6000.0
   end_time = 180000.0