diff --git a/module/Rest/config/entities-mappings/Shlinkio.Shlink.Rest.Entity.ApiKeyRole.php b/module/Rest/config/entities-mappings/Shlinkio.Shlink.Rest.Entity.ApiKeyRole.php
index 9c6355e3..b7787b1a 100644
--- a/module/Rest/config/entities-mappings/Shlinkio.Shlink.Rest.Entity.ApiKeyRole.php
+++ b/module/Rest/config/entities-mappings/Shlinkio.Shlink.Rest.Entity.ApiKeyRole.php
@@ -24,7 +24,7 @@ return static function (ClassMetadata $metadata, array $emConfig): void {
 
     $builder->createField('roleName', Types::STRING)
             ->columnName('role_name')
-            ->length(256)
+            ->length(255)
             ->nullable(false)
             ->build();