diff --git a/src/store/group_config.rs b/src/store/group_config.rs
index 08c086b..15fe25c 100644
--- a/src/store/group_config.rs
+++ b/src/store/group_config.rs
@@ -458,7 +458,7 @@ impl GroupConfig {
     /// Check if the user's server is banned
     fn is_users_server_banned(&self, acct: &str) -> bool {
         let server = acct_to_server(acct);
-        self.is_server_banned(server)
+        self.is_server_banned(&server)
     }
 
     pub(crate) fn can_write(&self, acct: &str) -> bool {
@@ -574,8 +574,8 @@ impl GroupConfig {
     }
 }
 
-fn acct_to_server(acct: &str) -> &str {
-    acct.split('@').nth(1).unwrap_or_default()
+fn acct_to_server(acct: &str) -> String {
+    crate::utils::acct_to_server(acct).unwrap_or_default()
 }
 
 #[cfg(test)]
@@ -594,9 +594,9 @@ mod tests {
 
     #[test]
     fn test_acct_to_server() {
-        assert_eq!("pikachu.rocks", acct_to_server("raichu@pikachu.rocks"));
-        assert_eq!("pikachu.rocks", acct_to_server("m@pikachu.rocks"));
-        assert_eq!("", acct_to_server("what"));
+        assert_eq!("pikachu.rocks".to_string(), acct_to_server("raichu@pikachu.rocks"));
+        assert_eq!("pikachu.rocks".to_string(), acct_to_server("m@pikachu.rocks"));
+        assert_eq!("".to_string(), acct_to_server("what"));
     }
 
     #[test]