diff --git a/src/datatypes.f90 b/src/datatypes.f90
index 052e8d374e..855b91c141 100644
--- a/src/datatypes.f90
+++ b/src/datatypes.f90
@@ -16,9 +16,9 @@ module datatypes
 
   implicit none
 
-  integer, parameter :: HASH_SIZE       = 4993
-  integer, parameter :: HASH_MULTIPLIER = 31
-  integer, parameter :: DICT_NULL       = 0
+  integer, parameter, private :: HASH_SIZE       = 4993
+  integer, parameter, private :: HASH_MULTIPLIER = 31
+  integer, parameter, private :: DICT_NULL       = 0
 
 !===============================================================================
 ! LIST Interfaces -- these allow one to use a single subroutine or function for
diff --git a/src/initialize.f90 b/src/initialize.f90
index ecb1abf9ea..45283238c8 100644
--- a/src/initialize.f90
+++ b/src/initialize.f90
@@ -3,7 +3,7 @@ module initialize
   use constants
   use cross_section,    only: read_xs, read_xsdata
   use datatypes,        only: dict_create, dict_add_key, dict_get_key,         &
-                              dict_has_key, DICT_NULL, dict_keys
+                              dict_has_key, dict_keys
   use datatypes_header, only: ListKeyValueII, DictionaryII
   use energy_grid,      only: unionized_grid, original_indices
   use error,            only: fatal_error