diff --git a/ThirdParty/exodusII/vtkexodusII/src/ex_create_par.c b/ThirdParty/exodusII/vtkexodusII/src/ex_create_par.c
index bf5bb44711..1fe5cd9737 100644
--- a/ThirdParty/exodusII/vtkexodusII/src/ex_create_par.c
+++ b/ThirdParty/exodusII/vtkexodusII/src/ex_create_par.c
@@ -614,5 +614,5 @@ int ex_create_par_int(const char *path, int cmode, int *comp_ws, int *io_ws, MPI
  * Prevent warning in some versions of ranlib(1) because the object
  * file has no symbols.
  */
-const char exodus_unused_symbol_dummy_1;
+extern const char exodus_unused_symbol_dummy_1;
 #endif