diff --git a/src/http/modules/ngx_http_range_filter_module.c b/src/http/modules/ngx_http_range_filter_module.c
index 7ad9db9..ac910fd 100644
--- a/src/http/modules/ngx_http_range_filter_module.c
+++ b/src/http/modules/ngx_http_range_filter_module.c
@@ -377,6 +377,10 @@
             range->start = start;
             range->end = end;
 
+            if (size > NGX_MAX_OFF_T_VALUE - (end - start)) {
+                return NGX_HTTP_RANGE_NOT_SATISFIABLE;
+            }
+
             size += end - start;
 
             if (ranges-- == 0) {