diff --git a/services.py b/services.py
index 641ffce..493810d 100644
--- a/services.py
+++ b/services.py
@@ -3,7 +3,7 @@ import re
 
 async def check_lnaddress_format(username: str) -> bool:
     # check username complies with lnaddress specification
-    if not re.match("^[a-z0-9-_.]{3,15}$", username):
-        assert False, "Only letters a-z0-9-_. allowed, min 3 and max 15 characters!"
+    if not re.match("^[a-z0-9-_.]{3,64}$", username):
+        assert False, "Only letters a-z0-9-_. allowed, min 3 and max 64 characters!"
         return
     return True