diff --git a/apps/s_server.c b/apps/s_server.c
index eaecb7e..d32b9df 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -1963,6 +1963,7 @@
     ssl_excert_free(exc);
     sk_OPENSSL_STRING_free(ssl_args);
     SSL_CONF_CTX_free(cctx);
+    release_engine(engine);
     BIO_free(bio_s_out);
     bio_s_out = NULL;
     BIO_free(bio_s_msg);