diff --git a/backend/app/views/auth/services.py b/backend/app/views/auth/services.py
index 13ff2fb..79ca9f5 100644
--- a/backend/app/views/auth/services.py
+++ b/backend/app/views/auth/services.py
@@ -175,7 +175,7 @@ def patch_anon_name(
 def get_captcha(
     captcha_id: uuid.UUID, db: Annotated[Session, Depends(get_db)]
 ) -> BytesIO:
-    prompt = "".join(random.choice(CAPTCHA_SYMBOLS) for i in range(6))
+    prompt = "".join(random.choice(CAPTCHA_SYMBOLS) for i in range(4))
     c = models.Captcha(id=captcha_id, prompt=prompt)
     try:
         db.add(c)