diff --git a/include/openmc.h b/include/openmc.h
index 03597e5a1..5f778397e 100644
--- a/include/openmc.h
+++ b/include/openmc.h
@@ -51,7 +51,7 @@ extern "C" {
   int openmc_init_f(const int* intracomm);
   int openmc_legendre_filter_get_order(int32_t index, int* order);
   int openmc_legendre_filter_set_order(int32_t index, int order);
-  int openmc_load_nuclide(char name[]);
+  int openmc_load_nuclide(const char name[]);
   int openmc_material_add_nuclide(int32_t index, const char name[], double density);
   int openmc_material_get_densities(int32_t index, int** nuclides, double** densities, int* n);
   int openmc_material_get_id(int32_t index, int32_t* id);