Index: src/tls/tls_client.c
===================================================================
--- src/tls/tls_client.c.orig
+++ src/tls/tls_client.c
@@ -363,6 +363,12 @@ TLS_APPL_STATE *tls_client_init(const TL
     SSL_CTX_set_security_level(client_ctx, 0);
 #endif
 
+    /* Keep memory usage as low as possible */
+
+#ifdef SSL_MODE_RELEASE_BUFFERS
+    SSL_CTX_set_mode(client_ctx, SSL_MODE_RELEASE_BUFFERS);
+#endif
+
     /*
      * See the verify callback in tls_verify.c
      */
Index: src/tls/tls_server.c
===================================================================
--- src/tls/tls_server.c.orig
+++ src/tls/tls_server.c
@@ -454,6 +454,12 @@ TLS_APPL_STATE *tls_server_init(const TL
     SSL_CTX_set_security_level(server_ctx, 0);
 #endif
 
+    /* Keep memory usage as low as possible */
+
+#ifdef SSL_MODE_RELEASE_BUFFERS
+    SSL_CTX_set_mode(server_ctx, SSL_MODE_RELEASE_BUFFERS);
+#endif
+
     /*
      * See the verify callback in tls_verify.c
      */