diff --git a/modules/script.c b/modules/script.c
index 63928a6..7e4a7d5 100644
--- a/modules/script.c
+++ b/modules/script.c
@@ -299,7 +299,7 @@ data_received(struct module *mod, const char *data, size_t len)
     struct private *m = mod->private;
 
     if (len > m->recv_buf.sz - m->recv_buf.idx) {
-        size_t new_sz = m->recv_buf.sz == 0 ? 1024 : m->recv_buf.sz * 2;
+        size_t new_sz = m->recv_buf.sz == 0 ? m->recv_buf.idx + len : m->recv_buf.sz * 2;
         char *new_buf = realloc(m->recv_buf.data, new_sz);
 
         if (new_buf == NULL)