diff --git a/src/ssl.c b/src/ssl.c
index a0feebe..82ed595 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -182,6 +182,10 @@ static int ssl_send(void *ctx, const char *data, size_t count, size_t *sent,
         ssl->error = SSL_ERROR_SSL;
         return LSEC_IO_SSL;
       }
+      /* Return failure when SSL reports syscall error
+       * but errno is not set to break send operation. */
+      if (errno == 0)
+        return LSEC_IO_SSL;
       if (err == 0)
         return IO_CLOSED;
       return lsec_socket_error();