diff --git a/app/form/SeasQDDiscreteGreenOperator.cpp b/app/form/SeasQDDiscreteGreenOperator.cpp
index dd7f7b28..316ba981 100644
--- a/app/form/SeasQDDiscreteGreenOperator.cpp
+++ b/app/form/SeasQDDiscreteGreenOperator.cpp
@@ -245,7 +245,7 @@ PetscInt SeasQDDiscreteGreenOperator::create_discrete_greens_function() {
     CHKERRTHROW(MatCreateDense(comm, m, n, PETSC_DECIDE, PETSC_DECIDE, nullptr, &G_));
     CHKERRTHROW(MatSetBlockSizes(G_, m_bs, n_bs));
     CHKERRTHROW(MatGetSize(G_, &M, &N));
-    CHKERRTHROW(PetscPrintf(comm, "Green's function operator size: %D x %D\n", M, N));
+    CHKERRTHROW(PetscPrintf(comm, "Green's function operator size: %" PetscInt_FMT " x %" PetscInt_FMT "\n", M, N));
 
     S_ = std::make_unique<PetscVector>(slip_block_size, num_local_elements, comm);
     t_boundary_ = std::make_unique<PetscVector>(m_bs, num_local_elements, comm);
@@ -281,7 +281,7 @@ void SeasQDDiscreteGreenOperator::write_discrete_greens_operator(
                             "write_discrete_greens_operator():matrix %1.2e (sec)\n",
                             (double)(t1 - t0)));
     CHKERRTHROW(PetscPrintf(PetscObjectComm((PetscObject)G_),
-                            "  status: computed %D / pending %D\n", current_gf, n_gf - current_gf));
+                            "  status: computed %" PetscInt_FMT " / pending %" PetscInt_FMT "\n", current_gf, n_gf - current_gf));
 
     write_facet_labels_IS(mesh);
 }
@@ -514,7 +514,7 @@ PetscInt SeasQDDiscreteGreenOperator::load_discrete_greens_operator(
     CHKERRTHROW(PetscTime(&t1));
     CHKERRTHROW(PetscPrintf(PetscObjectComm((PetscObject)G_),
                             "load_discrete_greens_operator() %1.2e (sec)\n", (double)(t1 - t0)));
-    CHKERRTHROW(PetscPrintf(PetscObjectComm((PetscObject)G_), "  status: loaded %D / pending %D\n",
+    CHKERRTHROW(PetscPrintf(PetscObjectComm((PetscObject)G_), "  status: loaded %" PetscInt_FMT " / pending %" PetscInt_FMT "\n",
                             current_gf, n_gf - current_gf));
 
     if (repartition_gfs_) {
@@ -565,12 +565,12 @@ void SeasQDDiscreteGreenOperator::partial_assemble_discrete_greens_function(
     auto ghost = scatter.template recv_prototype<double>(slip_block_size, ALIGNMENT);
 
     CHKERRTHROW(PetscPrintf(PetscObjectComm((PetscObject)G_),
-                            "partial_assemble_discrete_greens_function() [%D , %D)\n", start, N));
+                            "partial_assemble_discrete_greens_function() [%" PetscInt_FMT " , %" PetscInt_FMT ")\n", start, N));
     solve_time = 0.0;
     for (PetscInt i = start; i < N; ++i) {
 
         CHKERRTHROW(PetscPrintf(PetscObjectComm((PetscObject)G_),
-                                "Computing Green's function %D / %D\n", i, N));
+                                "Computing Green's function %" PetscInt_FMT " / %" PetscInt_FMT "\n", i, N));
         sw.start();
         CHKERRTHROW(VecZeroEntries(S_->vec()));
         if (i >= nb_offset && i < nb_offset + m) {