diff --git a/verification/isomip/code_ad/SIZE.h_mpi b/verification/isomip/code_ad/SIZE.h_mpi
index d5667fc6ae..dcdb034c93 100644
--- a/verification/isomip/code_ad/SIZE.h_mpi
+++ b/verification/isomip/code_ad/SIZE.h_mpi
@@ -44,8 +44,8 @@ CEOP
       PARAMETER (
      &           sNx =  25,
      &           sNy =  25,
-     &           OLx =   3,
-     &           OLy =   3,
+     &           OLx =   4,
+     &           OLy =   4,
      &           nSx =   1,
      &           nSy =   2,
      &           nPx =   2,