diff --git a/aimenet-web/lib/aime-card.ts b/aimenet-web/lib/aime-card.ts
index 9993aa3..aa73009 100644
--- a/aimenet-web/lib/aime-card.ts
+++ b/aimenet-web/lib/aime-card.ts
@@ -4,13 +4,23 @@ export const CARD_ID_REGEX = /^(?:[0-9]{4} ?){5}$/i;
  * Generates a random Aime card id.
  */
 export function generateAimeCardId(): string {
-    let id: string;
+    let cardId = '';
 
-    do {
-        id = Math.floor(Math.random() * 1e20).toString().padStart(20, '0');
-    } while (id[0] === '3'); // https://gitea.tendokyu.moe/Dniel97/segatools/src/commit/37c26ecadb2ce4d2cb3a61ce96c2c931ba2fc346/aimeio/aimeio.c#L191
-    
-    return id;
+    while (true) {
+        // don't start with a 3
+        const firstDigit = Math.floor(Math.random() * 10);
+        
+        if (firstDigit !== 3) {
+            cardId = firstDigit.toString();
+            break;
+        }
+    }
+
+    for (let i = 0; i < 19; i++) {
+        cardId += Math.floor(Math.random() * 10).toString();
+    }
+
+    return cardId;
 }
 
 /**