diff --git a/src/netbeans.c b/src/netbeans.c
index ad049a2..ccff3a5 100644
--- a/src/netbeans.c
+++ b/src/netbeans.c
@@ -674,11 +674,19 @@
     {
 	if (bufno >= buf_list_size) // grow list
 	{
-	    nbbuf_T *t_buf_list = buf_list;
+	    nbbuf_T	*t_buf_list = buf_list;
+	    size_t	bufsize;
 
 	    incr = bufno - buf_list_size + 90;
 	    buf_list_size += incr;
-	    buf_list = vim_realloc(buf_list, buf_list_size * sizeof(nbbuf_T));
+	    bufsize = buf_list_size * sizeof(nbbuf_T);
+	    if (bufsize == 0 || bufsize / sizeof(nbbuf_T)
+						      != (size_t)buf_list_size)
+	    {
+		// list size overflow, bail out
+		return NULL;
+	    }
+	    buf_list = vim_realloc(buf_list, bufsize);
 	    if (buf_list == NULL)
 	    {
 		vim_free(t_buf_list);