diff --git a/src/pki_crypto.c b/src/pki_crypto.c
index 0beee816..663e1441 100644
--- a/src/pki_crypto.c
+++ b/src/pki_crypto.c
@@ -1746,6 +1746,7 @@ ssh_string pki_key_to_blob(const ssh_key key, enum ssh_key_e type)
         bignum_safe_free(bn);
         bignum_safe_free(be);
         OSSL_PARAM_free(params);
+        params = NULL;
 #endif /* OPENSSL_VERSION_NUMBER */
         break;
     }
@@ -1998,6 +1999,7 @@ ssh_string pki_key_to_blob(const ssh_key key, enum ssh_key_e type)
 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
         bignum_safe_free(bd);
         OSSL_PARAM_free(params);
+        params = NULL;
 #endif /* OPENSSL_VERSION_NUMBER */
         break;
     }