diff --git a/mongoose.c b/mongoose.c
index 44539e81..34708869 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -4725,6 +4725,7 @@ static void handle_tls_recv(struct mg_connection *c) {
   size_t avail = mg_tls_pending(c); 
   size_t min = avail > MG_MAX_RECV_SIZE ? MG_MAX_RECV_SIZE : avail;
   struct mg_iobuf *io = &c->recv;
+  if (avail == 0) return;
   if (io->size - io->len < min && !mg_iobuf_resize(io, io->len + min)) {
     mg_error(c, "oom");
   } else {
diff --git a/src/net_builtin.c b/src/net_builtin.c
index 57b40176..c5f364de 100644
--- a/src/net_builtin.c
+++ b/src/net_builtin.c
@@ -645,6 +645,7 @@ static void handle_tls_recv(struct mg_connection *c) {
   size_t avail = mg_tls_pending(c); 
   size_t min = avail > MG_MAX_RECV_SIZE ? MG_MAX_RECV_SIZE : avail;
   struct mg_iobuf *io = &c->recv;
+  if (avail == 0) return;
   if (io->size - io->len < min && !mg_iobuf_resize(io, io->len + min)) {
     mg_error(c, "oom");
   } else {