diff --git a/c_src/enacl_nif.c b/c_src/enacl_nif.c
index b62f746..268096a 100644
--- a/c_src/enacl_nif.c
+++ b/c_src/enacl_nif.c
@@ -48,6 +48,17 @@ static int enacl_crypto_load(ErlNifEnv *env, void **priv_data,
   return 0;
 }
 
+static int enacl_crypto_upgrade(ErlNifEnv* env, void **priv_data,
+                                void **old_priv_data,
+                                ERL_NIF_TERM load_info) {
+    return 0;
+}
+
+static int enacl_crypto_unload(ErlNifEnv* env, void **priv_data,
+                                ERL_NIF_TERM load_info) {
+    return 0;
+}
+
 /* GENERAL ROUTINES
  *
  * These don't generally fit somewhere else nicely, so we keep them in the main
@@ -421,4 +432,4 @@ static ErlNifFunc nif_funcs[] = {
         "crypto_secretstream_xchacha20poly1305_pull", 3,
         enacl_crypto_secretstream_xchacha20poly1305_pull)};
 
-ERL_NIF_INIT(enacl_nif, nif_funcs, enacl_crypto_load, NULL, NULL, NULL);
+ERL_NIF_INIT(enacl_nif, nif_funcs, enacl_crypto_load, NULL, enacl_crypto_upgrade, enacl_crypto_unload);