diff --git a/policies/register.rego b/policies/register.rego
index 34ada0216..612308822 100644
--- a/policies/register.rego
+++ b/policies/register.rego
@@ -19,7 +19,7 @@ violation[{"field": "username", "msg": "username too short"}] {
 }
 
 violation[{"field": "username", "msg": "username too long"}] {
-	count(input.username) >= 15
+	count(input.username) > 64
 }
 
 violation[{"field": "username", "msg": "username contains invalid characters"}] {
diff --git a/policies/register_test.rego b/policies/register_test.rego
index 7e4ca3a01..6d1293fdf 100644
--- a/policies/register_test.rego
+++ b/policies/register_test.rego
@@ -45,7 +45,7 @@ test_short_username {
 }
 
 test_long_username {
-	not allow with input as {"username": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaa", "registration_method": "upstream-oauth2"}
+	not allow with input as {"username": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", "registration_method": "upstream-oauth2"}
 }
 
 test_invalid_username {