diff --git a/src/os/unix/ngx_files.c b/src/os/unix/ngx_files.c
index 7a5caa5..c9e62b2 100644
--- a/src/os/unix/ngx_files.c
+++ b/src/os/unix/ngx_files.c
@@ -16,6 +16,8 @@
         return NGX_ERROR;
     }
 
+    file->offset += n;
+
     return n;
 }