diff --git a/duo_universal/client.py b/duo_universal/client.py
index 4e1bc03..0c78935 100644
--- a/duo_universal/client.py
+++ b/duo_universal/client.py
@@ -28,7 +28,7 @@
 ERR_REDIRECT_URI = 'No redirect uri'
 ERR_CODE = 'Missing authorization code'
 ERR_UNKNOWN = 'An unknown error has occurred.'
-ERR_GENERATE_LEN = 'Length needs to be at least 22'
+ERR_GENERATE_LEN = 'Length needs to be at least 16'
 ERR_STATE_LEN = ('State must be at least {MIN} characters long and no longer than {MAX} characters').format(
     MIN=MINIMUM_STATE_LENGTH,
     MAX=MAXIMUM_STATE_LENGTH