diff --git a/libmariadb/secure/openssl.c b/libmariadb/secure/openssl.c
index a21d692e0..ef6be9b14 100644
--- a/libmariadb/secure/openssl.c
+++ b/libmariadb/secure/openssl.c
@@ -529,7 +529,7 @@ ma_tls_async_check_result(int res, struct mysql_async_context *b, SSL *ssl)
 {
   int ssl_err;
   b->events_to_wait_for= 0;
-  if (res >= 0)
+  if (res > 0)
     return 1;
   ssl_err= SSL_get_error(ssl, res);
   if (ssl_err == SSL_ERROR_WANT_READ)