diff --git a/src/main.rs b/src/main.rs
index 4a3f160..2c9f9f7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -44,8 +44,8 @@ async fn main() {
     let configuration = Configuration::new("config.json");
     let configuration_rc = Arc::new(configuration);
     let mut spam_file = None;
-    if configuration_rc.username_prefix().len() > 14 {
-        error!("Error: Username prefix should not longer than 14");
+    if configuration_rc.username_prefix().len() > 30 {
+        error!("Error: Username prefix should not longer than 30");
         return;
     }
     if !configuration_rc.clone().spam_file().is_empty() {
diff --git a/src/utils.rs b/src/utils.rs
index 0037cd0..352a7b0 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -57,6 +57,6 @@ pub fn generate_string(len_min: i64, len_max: i64) -> String {
 
 pub fn generate_username(config: &Arc<Configuration>) -> String {
    config.username_prefix().to_string() + generate_string(
-    2,16-config.username_prefix().len() as i64
+    2,32-config.username_prefix().len() as i64
    ).to_string().as_str()
 }
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