diff --git a/tests/data/test1406 b/tests/data/test1406
index ab0f6e48b7d5905473541e8e4565b415776043f7..664f75029f57248d159b5ea0888b698d332be3de 100644
--- a/tests/data/test1406
+++ b/tests/data/test1406
@@ -70,7 +70,7 @@ int main(int argc, char *argv[])
   slist1 = curl_slist_append(slist1, "1406@foobar.example");
 
   hnd = curl_easy_init();
-  curl_easy_setopt(hnd, CURLOPT_INFILESIZE_LARGE, (curl_off_t)34);
+  curl_easy_setopt(hnd, CURLOPT_INFILESIZE_LARGE, (curl_off_t)38);
   curl_easy_setopt(hnd, CURLOPT_URL, "smtp://%HOSTIP:%SMTPPORT/user");
   curl_easy_setopt(hnd, CURLOPT_HEADER, 1L);
   curl_easy_setopt(hnd, CURLOPT_UPLOAD, 1L);