diff --git a/src/http/modules/ngx_http_range_filter_module.c b/src/http/modules/ngx_http_range_filter_module.c
index ac910fd..292a2b8 100644
--- a/src/http/modules/ngx_http_range_filter_module.c
+++ b/src/http/modules/ngx_http_range_filter_module.c
@@ -355,7 +355,7 @@
         }
 
         if (suffix) {
-            start = content_length - end;
+            start = (end < content_length) ? content_length - end : 0;
             end = content_length - 1;
         }