diff --git a/src/mcnp/mcnp_funcs.cpp b/src/mcnp/mcnp_funcs.cpp
index 4b15a5eba..3a6393aa1 100644
--- a/src/mcnp/mcnp_funcs.cpp
+++ b/src/mcnp/mcnp_funcs.cpp
@@ -1,7 +1,6 @@
 #include "mcnp_funcs.h"
 
 #include "DagMC.hpp"
-#include "dagmcmetadata.hpp"
 #include "util.hpp"
 
 using moab::DagMC;
@@ -202,10 +201,10 @@ void write_cell_cards(std::ostringstream& lcadfile,
       // that material numbers are assigned
       mat_num = DMD->volume_material_data_eh[entity];
       // if we cant make an int from the mat_num
-       if (dagmc_util::lowercase_str(mat_num) !=
-              dagmc_util::lowercase_str(DMD->graveyard_mat_str()) &&
-          dagmc_util::lowercase_str(mat_num) !=
-              dagmc_util::lowercase_str(DMD->vacuum_mat_str())) {
+       if (DMD->to_lower(mat_num) !=
+              DMD->to_lower(DMD->graveyard_mat_str()) &&
+          DMD->to_lower(mat_num) !=
+              DMD->to_lower(DMD->vacuum_mat_str())) {
          if (!DMD->try_to_make_int(mat_num)) {
            std::cerr << "Failed to cast material number to an integer"
                      << std::endl;