diff --git a/testprof/pkcs_1_pss_test.c b/testprof/pkcs_1_pss_test.c
index fe6dbdf..ceeb809 100644
--- a/testprof/pkcs_1_pss_test.c
+++ b/testprof/pkcs_1_pss_test.c
@@ -47,6 +47,8 @@ int pkcs_1_pss_test(void)
     mp_clear_multi(key->d,  key->e, key->N, key->dQ, key->dP, key->qP, key->p, key->q, NULL);
   } /* for */
 
+  unregister_prng(&no_prng_desc);
+
   return 0;
 }