diff --git a/src/chat.rs b/src/chat.rs
index 945d2b0..964e423 100644
--- a/src/chat.rs
+++ b/src/chat.rs
@@ -1025,8 +1025,11 @@ pub fn handle_chat_scripts(
             }
             "registercontact" => {
                 if CONTACTS.contains(&param1) {
-                    prefs.contacts.push(param1.to_string());
-                    prefs.save();
+                    let param1_string = param1.to_string();
+                    if !prefs.contacts.contains(&param1_string) {
+                        prefs.contacts.push(param1_string);
+                        prefs.save();
+                    }
                 } else {
                     error!("Can't register contact `{param1}', it doesn't exist in the chat::CONTACTS constant.");
                 }