diff --git a/vlib/compiler/scanner.v b/vlib/compiler/scanner.v
index 846d9190d3..460ee3cd29 100644
--- a/vlib/compiler/scanner.v
+++ b/vlib/compiler/scanner.v
@@ -894,7 +894,7 @@ fn good_type_name(s string) bool {
 // registration_date good
 // registrationdate  bad
 fn (s &Scanner) validate_var_name(name string) {
-	if name.len > 11 && !name.contains('_') {
+	if name.len > 15 && !name.contains('_') {
 		s.error('bad variable name `$name`\n' +
 'looks like you have a multi-word name without separating them with `_`' +
 '\nfor example, use `registration_date` instead of `registrationdate` ')